Bad Service

I have had an alarm system installed in my property since 2021. I was advised by the sales consultant named Donald that I have a 3-year contract with ADT, and thereafter, it will be a month-to-month and I will own the unit. When I called in this morning to cancel, I was told I need to pay R650 for the unit to be removed from my property, which I was not informed of . I will not pay R650 when I had a 3 year contract with ADT!!!!