Door-to-door water heater company signed contract with tenant 2 years ago, what are the options now? 2 years ago, a door-to-door company signed a water heater contract with a friend's tenant. (Not sure the exact circumstances, but can only assume the tenant got scammed)

Now the tenant has left and the landlord discovered this charge on the Enbridge bill.

What's more is the old tank was not property returned, and the landlord is also getting billed by the old company.

What are the options at this point....help?