American Drain Cleaning Svc

I was told I would have a free estimate on a gas leak. They came out hooked everything up. My pressure held for 30 min. Then said they would check my one T-joint to ensure it wasnt leaking. The tightened the 2 bolts on it to make sure. Got out and handed me a bill...thats right 250 for the check and 150 for each leak??? They did have to tighten those 2 bolts. I ended up calling the office to complain and was told it was right. He should have given me an estimate first so they would "work with me on the bill" and only charge 125. Well I called the police to report them and the owner called and told his driver to leave..dont know what will happen now. The driver was friendly and polite. I think the situation was WRONG.