[WLT17]

So, a month after returning my iphone order to currys. They carried out 2 investigations as my parcel was missing. Was promised a refund by 1 agent about a week ago. Now they have sent me an email saying they have received the wrong item. Im guessing they opened it. What do i do now? I think i may push and say it cant be my fault as it was obviously out of my hands for so long, not sure how long it will take to get a refund though. Any suggestions welcome.