Rachel Morgan was left bitterly disappointed when her KFC Double Down burger measured up to be the same size as her son's Hot Wheels Car.

A woman has been left disappointed after buying a KFC Double Down that turned out to be the size of her son's Hot Wheels car.

Rachel Morgan said she was expecting her $10 original Double Down burger to be a lot bigger than around 6cm in size and called it a "rip off".

She purchased the burger from the KFC Auckland, Westgate drive through.

Rachel Morgan was left bitterly disappointed when her KFC Double Down burger measured up to be the same size as her son's Hot Wheels Car.

Her Double Down burger itself was "smashed" together with a little bit of cheese running out the side and looked less than appealing, she said.

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"It looked nothing like the picture. It was just cheese and two small chicken pieces, it was literally nothing else."

"I won't be getting another one. I think that's a rip off and not a value for money."

When comparing to other objects for sizes, it turned out to be around the same size as her son's Hot Wheels car, she said.

Once they were home, she said she approached KFC via their Facebook page. She said an employee responded to ask for her number. She's still waiting to hear from them.

She said she was disappointed that noone had made the effort to contact her and she said she felt like she was being ignored.

"I just think these big corporation giants, they're not making their customers happy, they don't care about the little guys."

"I don't think KFC is ready for home delivery if they can't get the drive through or their restaurant sorted first."