Hello
How long have had the phone is it outside of the 14 days cooling off period ? If you are outside of this then you will need to pay for phone.
Claiming not fit for purpose will be hard as the phone doesn't come with a google operating system and google were the people who decided to disallow Huawei the use of the Android Operating System, it is supplied as a mobile phone but never has claims be made that it will work the Google Play Store.
Regards Mike
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