How to repair the wire of the Brainwavz M1?


I had bought the M1 couple of years ago from pristinenote. But now the wire connecting the left ear phone has come out slightly. Therefore I have to adjust it whenever I use it, to ensure I'm able to hear from the left ear phone otherwise it plays in only one earpiece. So how can I repair it? Please reply as the problem is very annoying me.
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