Advancedairandheat

Purchased HVAC system for my elderly parents. Purchased 10yr extended warranty and Tappan had an extended warranty. 1 month "check up" 2 motors blew up. The technician stated that there was no cold air return duct work and this would cause dirt to be pulled into the system, over taxing the system. After 9 1/2 years of this company providing annual "check ups" he is the first person to check the cold air return. When I brought this to the companys attention I was told that they had photos of correct installation. They refuse to provide these photos. I was also told that the system is only expected to last 10 years and that they had provided $2,000.00 worth of repairs in the past 9 years. They would not provide additional information about the repairs. Were they covered by the warranty? How many other elders have they taken advantage of? They would not respond to my certified letter or the BBB.