Advanced level of tech service??????

Is there an advanced level of tech service when you call in for tech problems? I'm tired of calling in for help and being told "we need to replace the item" and then when you get the replacement it has the same issue. When my cams were updated to the new firmware 1.10 it took care of my initial problem of delayed recording, and I thought that would be the last problem. Then a cameras audio got stuck in the on mode and wouldn't turn off, I called, and they said we need to replace it. I just received the replacement outdoor camera and before I could even get it mounted it was bad. It would be nice if they would actually try to fix the problem over the phone instead of just replacing them.  This is the fourth time these cameras have been replaced, if these cameras are that bad, they should remove them from the market and do some research on new ones before selling them to the public. I am so tired of running to the post office to return these cameras. It's really bad when the postmaster asks you when you walk in if you have another bad camera to send back!!! Would also like to add that I haven't had my system for 2 months yet, I'm not sure if i can trust this system anymore.