Best Diagnose Drain Issues in Phoenix AZ

A/C stopped working, called on a Saturday morning and tech was out that afternoon. System was installed new by Parker & Sons 4 years ago, still under warranty. Tech did not have part to make the repair, was going to order it and give me a status report on Monday morning. Then tech tried to sell me on a surge protector for the HVAC system. Said it was necessary but could not tell me why they didn't install one when they first put the system in. If it was that necessary, why wasn't it installed then? Of course, got no answer. Received no call on Monday. Called first thing Tuesday to get a status, was told they had received the part on Monday and are ready to finish the repair. Tech came out on Tuesday afternoon and finished. Was then informed that there was a $95 charge that was called a deductible. First explanation was that we did not do the necessary system inspections and that's why we were being charged. I informed the tech that inspections were done and paperwork could be produced. Inspections were done by another company due to lack of professionalism from Parker & Sons. Second explaination for the charge was due to the cost of location and picking up the needed part, the part that was under warranty. Paid the charge and called the CS rep that I initially talked to, was given his voice mail. Still waiting for a call back, it's been over a week. I've been told that I must buy an inspection package thru Parker & Sons or the remaining 6 years on the warranty will be null and void. I have talked to four people there to try and explain all the reasons for my disatisfaction (we have had other garbage work done by them), but nobody cares to listen. I am frustrated with the lack of professionalism, lack of quality work, constant upselling of unnecessary products and services, no returning of phone calls and upper management indifference. I figure I have 6 more years of them holding me hostage before I can deal with a company that cares more about their customers.