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Hello, thank you for the question.
Did you ask for a larger phone at the time of requesting the upgrade.
Under the Consumer Rights Act 2015 the product has to be as described and fit for purpose. If you stated you wanted a larger phone and they gave you a smaller one, you could argue breach of the consumer rights legislation and demand a refund or a replacement phone.
I look forward to hearing from you (I am just about to go out but will reply to your message this afternoon)