Way back in 1994 (the year I bought this place) I had a contract with the oil supplier to supply furnace oil to me. I wanted to go immediately on the 'will call' plan, because we also had wood heat. They said "no" we'll put you on the 'degree plan' which to this day I have no idea what the criteria is. Long story shorter, after one time pumping 50L ( about 10 gallons) they took me off the degree plan, but didn't call and say anything, 2 months later we woke up to a cold house and no oil. (We had run out of wood).
I called them up and told them to get down here (80 mile drive round trip) and get the furnace going, PDQ. We've got a contract and you (the supplier) just breached it. I gave them 1 hour to do the deed or I was calling my lawyer. 45 minutes later they were here, filled the tank, relighted the furnace and checked to make sure the pipes weren't frozen.
I figured that the lawyer threat would let them know that I wasn't going to take any B.S. from the biggest oil and fuel supplier in Canada.
I am still on the will call plan 26 years later, with $1200.oo worth of credit in my account.