Do phones4u buy faulty iphones?

I bought my iPhone 4S from phones4u over a year ago but it's now completely broke and won't turn on. I went back and got an early upgrade to a different network so have to cancel my O2 contract which will be about £350, but phones for you said it would only be £220 and if I give them my faulty phone that will be £75 off and they also have me £30 cash but I'm not sure why? They said to come back to the shop within 7 days but couldn't get there as I had work, it's been 8 days.

I'm really confused please help!

I think you should wait for few more days!

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