Assured Heating & Cooling

I was directed to Assured by my home warranty company. We called due to an unusual flame pattern. We even asked them about the heat exchanger because we had heard that is a common cause. They came out, tightened a hose, and assured us there were no other issues.
Now that it's cold we have found that our furnace is unacceptably loud (think an airplane taking off). We called them out (it took over 4 phone calls and a week and a half for them to schedule an appointment). They called the night before and said they might not be able to make it, but they'd call right back. Never called back, and didn't come or call until after the original planned time. When they came out they did NOTHING and told us we just have a "loud furnace". We had to pay our $100 deductible to them twice now.
We were still unhappy so had our own person come out, who in under 30 minutes, was able to find that we had a cracked head exchanger and that the cause of the noise was a cracked impeller from the exhaust motor. When I confronted Rick at Assured with this info, he stated that we didn't ask them specifically to look at those things. Terrible company, rather than disputing the claim, I am going to pay my deductible again to have a different company come out to do repairs because I don't want to pay Assured one more dollar.