Phone not working after less than 2 months

I'm utterly confused about my review. I ordered an IPhone Xr for my partner . We recieved the phone at the end of September ( around the 26th , I think ) . We were honestly really happy with the phone and initially had NO issues . He put his phone down to charge about 3 weeks ago ( I'll need to check the dates with him ) but the phone just switched off completely amd would not switch on again . We thought it might be that the wall plug is broken , but it wasn't that because my phone charged perfectly. Now we are sitting with a phone that can't be used . I've requested that the phone be collected to be looked at , but it was declined . We understand that the phone is refurbished, but how can we be expected to pay full price for a phone that we haven't even been able to use for 2 months ? Disclaimer , I gave 2 stars coz the phone was working great at first otherwise it would have been -1.