What are shop rules on miss sold iPhones?

Hi, this is a strange problem but basically I traded in my iPhone 4 to upgrade to the iPhone 4S today and when I got home and started to set up my new iPhone it had been labelled up in the shop as an iPhone 4S for 275 but it was only an iPhone 4, I would like to know what the best result I can get? For example discounted price and iPhone 4S or what?

Definitely discounted price. Depends on the store/seller/deal

Money back.

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