Wireless headphones (need fixing) (Parkside SK7)

They arrived broken was given a full refund and told her to get rid of one of the years isn't working but I have looked inside and there is a small wire that has come loose from the solder if somebody wanted to re-sold the wire, I'm sure these would work perfectly, but despite having the tools and the ability to do it, I don't have the time. The other side is working completely. They weren't very expensive. Bluetooth does connect