T&J contracting

T&J put a new roof on my house. They're work is very good. However, the estimate was high, but they weren't sure what was under the shingles. The estimate was padded in case boards needed to be replaced. I was promised a refund if there wasn't a problem. There was no problem with the roof, plus I had to pay for a dumpster. I was promised that would be part of my refund. They were also supposed to put a ceiling on my porch, which they never did. I talked with Trevor once, he told me a refund would be sent out. It's been 3 months and I haven't received a refund. I've called and left messages, but no one has returned my calls.