This past June my Central Cooling unit stopped working and I got it repaired. $3000 for parts and labor, paid cash, got a receipt, shook hands with the technician, and all was said and done. In my mail today I received a bill notifying me that I was past due on a payment of a balance of $6000 and that a collection agency would become involved if the debt wasn't settled. I immediately called the company, Comfort Heating and Air, and voiced my complaint. In less than five minutes, the receptionist answered the phone, contacted her regional supervisor, and cleared the issue when it turned out that the same service had been entered into their system twice. No hassle, no treating me like I was trying to evade payment, they took the side of at fault even before the discrepancy had been uncovered. I can't recommend them or their heating and cooling systems highly enough and enrolled in a bi-yearly service plan with them before ending the call just because I really felt like they value me as a customer.