Enercare Home Services

I have my water heater rented ,not by me, from 2008 august 29th. (Bought the house with the water heater)...the rent payment came on my name but there is no written contract between me & Enercare. All this years nobody was interested to maintain the unit...Only to collect the rent...When I said that I will to install my own unit I find out that I have to drop off myself the water heater...Under which contract ,again, I have to do this? Where is written that I have to do so? I was filling up an appointment form one week ago,for an estimate for A/C + furnace...Result-zero. Nobody bother...