Poor quality hair zero customer care

Received my wig with the adjusting belt sawn over therefore l cannot adjust it when l wear. I contacted them the very day l received and was told to unstitch it and fix it myself, which l have no idea how to do . Or else l must pay for courier to send it back to them and pay courier again to get it back, there is other way of helping me. This is after l have already spent R1300 on the wig itself.