I was planning to upgrade my PTAC units and was lo...

I was planning to upgrade my PTAC units and was looking for a go-to company but I need to look elsewhere. I scheduled a service visit because I wanted qualified technicians to come and check my 2 PTAC units to make sure they are working properly a few months ago. The technicians came, took off the front cover and said that one unit is working fine and one requires new parts. There would be nothing wrong with that if it was not for the fact that taking off the front cover only exposes the unit inside. Nothing is visible to accurately determine condition of the units. The unit they determined works fine is not working fine and when I called the company, a very rude lady was asking me in if I am an expert on PTAC units. Clearly, I am not, otherwise I would not call the experts but it does not take a lot of figuring out to determine whether the unit is in working condition and I do not need to be an expert to know that you need to see inside the unit to check it properly. I was told that I would get a refund or at least partial credit but nobody has made an effort to resolve the issue in the past 3 months.