Sujan and Chandana Burra were robbed the day they took over ownership of the Woolston Discounter, on Ferry Rd. They have been robbed almost every month since.

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Sujan Burra was robbed the day he took ownership of his Christchurch dairy.

The Woolston Discounter, on Ferry Rd, has been held up almost every month since.

SUPPLIED Sujan Burra fought back as two men robbed a Woolson dairy of snacks on Saturday night.

After a knife-wielding robber in a skull mask stole cash earlier this month, Burra put a baseball bat under the counter and a lock on a gate at the end of the counter.

So when two offenders came in on Saturday night - the sixth robbery since September - he was prepared.

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JOHN KIRK-ANDERSON/FAIRFAX NZ Woolston Discounter owners Sujan and Chandana Burra have been robbed almost every month since they opened in September.

It started with a man wandering around the store and asking about the price of products about 7.20pm.

He "seemed like a regular customer", Burra said, until a second person, disguised in a dark sweatshirt, hat and mask, walked in.

The man tried to barge through the gate, which separates employees from the store. The lock kept him out.

The Woolston Discounter The Woolston Discounter was robbed for the fifth time earlier in April

Burra grabbed the bat. He swung it at the masked man.

Both men took off on bicycles with a handful of snacks.

The Discounter is about 200 metres from the Woolston Night 'n Day, which has been held-up nine times in eight months. That dairy set up a "safe room" at the back of the store, where attendants can lock themselves inside and call for help.

A masked intruder holding a knife came behind the counter in early April.

In Auckland, fed-up dairy owners marched on Sunday, calling on the Government for harsher penalties for thieves after a string of robberies left many scared to return to their stores.

Burra was stumped on how to stop thieves targeting the stores. Usually, they went after cash from the till or cigarettes.

"We can't close the business at 6pm, maybe there needs to be another CCTV camera installed outside to watch where they go. By the time the police arrive five minutes later, they're gone."

"We're an easy target, there's usually only one man on the till."

Though Saturday's incident was no great monetary loss, each theft made it harder to keep the business open, Burra said.

Detective Inspector Darryl Sweeney said police gave retailers advice and support on how to improve security and make their shops less attractive to thieves.

"All violent offences are taken seriously and investigated thoroughly to determine whether there may be any emerging patterns."

Anyone who found themselves in a robbery should comply with the offender's demands, Sweeney said.

"The risks just aren't worth it."

A police spokeswoman said an investigation into the Saturday night robbery was under way.