If the advertising is false you can ask fro your money back and if they refuse then you can sue for false and misleading conduct.
You need to get a copy of the advertisement and make sure it does mislead.
You can sue fro your money back and you should send them a copy of the advertisement and set out what the phone documentations says and ask for a refund and tell them they have mislead you.
Here is some information for you.
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