I used to heat with propane, I had more than a few shady bills from trigas and one other company.
I was on the "always full"" plan at trigas for a while, ran out of propane while out of town for a month and had called the day before I left to let them know I was between 5% and 10%. They filled it and locked it a week later because I had dropped below 5%. I came home to a frozen house and a note explaining that I needed the $100 pressure check. Never received a phone ccall. Trigas refused to do the pressure check for free and fix all the frozen junk in the house.
2 lawyer letters later they picked up the full tank for free and i started with Stevens propane, excellent customer service! Those people were an absolute joy to deal with!
When the tank gets low they seem all to eager to take advantage of the situation.
I have consumers natural gas now, seems good so far.
You should have called sooner! Sounds like an over reaction.