Ripped off on Adverts.ie (1 Viewer)

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Lads, my bass player is from Burgos. He joined and quickly found a decent amp for €150 on adverts. Was working fine until the sound cut out last night. The display still shows it's receiving sound, it just ain't putting any out.
Dude was "It was working fine for me" and didn't want to know. The sale was less than a month ago.

What would ye do in this situation?

What amp was it? Could be an easy fix.