Am i in the right or?...

[declantg]

So basically i recently listed my mobile phone on ebay and a user contacted me and asked to cancel the auction and they would paypal me 100 quid.

I took the offer and cancelled my listing, the user sent me the money and i sent the item a couple of days later.

when the item arrived the user then cancelled the paypal payment and also has the item.

I just contacted them and they are asking me to pay for a new battery cover because it "doesnt fit" even though it fit perfectly for the year i had it....

so in final, they are refusing to send me the money again unless i buy a new cover for them, WTF

So my paypal is in -£96 and im without a phone, where the f*ck do i stand?!