Faulty denon mc6000mk2

I no denon dj offer a year warranty on this device. It’s used once a week and kept in a gorilla Dj case. But I’ve had the channel replaced and now the sound is cutting out of the right side of the speaker connection and messing up with mic dropping sound. It was sent into be repaired by the company I purchased it from and they told me there’s no fault. I recorded part of the fault. And sent them proof but now there telling me it’s my problem the machine is literally 2 years now and out of the 2 years the company fixing it had it for 5 months?? Is there anything I can do?? Thanks