Headphones stopped working and customer support has been an absolute nightmare. I bought the M4's about 8 months ago and were working a dream, after updating them recently they keep turning off and don't work at all, after going through as many customer service routes as I can I just keep getting put in an endless loop. Nothing is working, appalling customer service, I just want my money back at this point. Sennheiser seriously need to step up their game.
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