Paramount car audio - what a let down !

Purchased a Paramount radio from ***, which was only installed a couple of weeks later, as I had to travel. All was well for a few days after getting back, then suddenly weird things started to happen. The nav would freeze and that froze the entire radio. Then the USB would start making a ********** noise and you'd have to pull it out and put it back to resume, which would be ok for a while, then the same would happen. I packed up all the necessary stuff into the box and took it back wanting a refund or different radio. The owner does not let you get a word in edgeways. I started to loose my sense of humour as he kept making excuses and wouldn't listen to what I had to say. Eventually he gets a book out with details pertaining to installations. After a min or so, says I installed the radio myself. I told him he definitely installed it as they contacted me and said I had to get an aerial connector. After some more looking, eventually finds it. Calls the guy that installed and says he must go check. After a while, the guy confirms the issues. He then says the unit will have to be sent away. More arguing pursues and eventually the unit is exchanged. The USB is still having the same issue, which plays fine on my laptop & bakkie and the maps now have some other issues, but I'm actually not interested in returning as he has absolutely no Customer s****s, is rude as hell and just doesn't listen to you. I will just not go there again. Be very careful of this Paramount brand & *** !