Melbourne residents have been left terrified with a massive crime wave spreading across the city's west as police reveal there have been four home invasions in just one week.

A Hillside mother-of-three remains sedated in hospital after she was tied up with a phone cord and bashed by two intruders who stole her car on Wednesday at 11am.

On Thursday at 7pm, eight men armed with metal poles broke into a home in Melton South while the family were watching television.

One day later, a Rockbank couple tricked a gang of seven suspected Apex members by giving them the wrong keys to one of their cars and a Brookfield family were left terrified when five burglars crept to steal mobile phones as they slept.

Scroll down for video

Melbourne residents have been left terrified with a massive crime wave spreading across the city's west. Hillside mother Marisa Bonacci (pictured) remains sedated in hospital after she was tied up with a phone cord and bashed on Wednesday

On Thursday, Riccardi Accaputo, 31, and his aunt were horrified after eight men broke into their Melton South home while they were watching television

On Tuesday, Assistant Commissioner Stephen Fontana said home invasions were a 'difficult type of offending' to police and described the perpetrators as 'hardcore individuals'.

'What we find is we have some hardcore individuals that seem to attract other young people and they could come from all parts of Melbourne or Victoria,' he told the Today Show.

'It seems to be they're really well connected via social networks'.

Assistant Commissioner Fontana advised residents to give up their car or property to violent home invaders to avoid being injured.

'Let them take it. These are really cowardly young people that are breaking in and best to avoid any confrontation with them,' he said.

Marisa Bonacci, 55, was home alone when she was tied up and attacked in a horrific daylight home intrusion on Wednesday.

She is sedated in hospital and suffered a suspected broken nose and significant bruising to her head and body.

The offenders stole her Volkswagen, which was found burnt out in Melton later that day.

Just four days later, a couple managed to trick a gang of African youths after they broke into their Rockbank home at 3am on Monday by giving them the wrong keys

Police found the Audi several kilometres away, but have no yet located the thieves

Marisa Bonacci, 55, was home alone when she was tied up and attacked in a horrific daylight home intrusion on Wednesday

Mr Accaputo's aunt, 68, (pictured) protected her nephew, who is on crutches and has a neck brace after being injured in an unrelated car crash in the Melton attack

On Thursday, Riccardi Accaputo, 31, and his aunt were horrified after eight men broke into their Melton South home while they were watching television at 7pm.

The men ransacked the home with metal poles and stole computers, jewellery and Mr Accaputo's white Ford.

'I was just watching TV, trying to relax, and before I knew it they've burst through the back corridor,' he told 7 News.

Mr Accaputo's aunt, 68, protected her nephew, who is on crutches and has a neck brace after being injured in an unrelated car crash.

Just four days later, a couple managed to trick a gang of African youths after they broke into their Rockbank home at 3am on Monday.

Sanna Naeem (pictured) and their two young sons were left terrified after five masked intruders broke into their Brookfield home at 1am on Monday

Ms Bonacci's Volkswagen was stolen and later found burnt out in Melton

Jade Ribeiro said her stepdad suffered a cut to his cheek and eyebrow in a violent home intrusion in Rockbank on Monday

The pair gave the intruders a set of car keys to the wrong car and the group fled the scene on foot.

The couple's daughter Jade Ribeiro said her stepdad suffered a cut to his cheek and eyebrow in the violent home intrusion and her 12-year-old brother has 'not stopped crying'.

'We're all shaken. How else can you be after you've had eight Sudanese men break into you, rough you up, beat up my step dad?' she told 7 News.

On the same day, Farrukh Naeem, his wife Sanna and their two young sons were left terrified after five masked intruders broke into their Brookfield home at 1am on Monday.

They stole the family's brand new Audi A5 after threatening the family with wooden stakes.

Police found the Audi several kilometres away, but have no yet located the thieves.

Just four days later, a couple managed to trick a gang of African youths after they broke into their Rockbank home with metal poles at 3am on Monday