Behringer K900FX

I've bought two of these amps in the last 4 months. The first one was a nightmare. I had to move it about and move it about before I could get any sound from it. The second one I had for almost 2 months before Ait started to malfunction. While I was playing it the sound would cut out, completely. Then, the sound would increase very slowly until it peaked and then the sound would lower until it was quiet. I've treated this amplifier exactly the way I should have but it still doesn't perform well. I've had amps over the last 40 years and have never had the problems that I've had with this one. I've spoken to Thomson, where I bought the amp and they tell me I am not able to get a refund. So, buyer beware, they love taking your money but they think that they can refuse me a refund. We will see about that as I'm planning on getting legal help. My statutory rights are being ignored and I'm not putting up with that.