A contract is a 2-way promise. In the elevator maintenance world, the elevator company promises to maintain and repair your elevator, and you promise to pay them. What happens if one of you doesn’t hold up your end of the bargain? Well, contracts address that too. So dig your copy out of the file drawer and see what it says.
It likely contains a provision that says if you don’t pay, they can stop taking care of your elevator. Click for the info you need.