Poor Customer service

So besides my home ,few months ago I installed a stand alone decoder at my shop, unfortunately I had to move out so I requested last month to the agent to disconnect that system , its seems they never follow my instructions and now I am expected to pay for that service which has been physically removed and not in use for over a month. I called this morning and explained this situation to another agent and after checking the system and asking a few questions ,she just placed me in hold for a few minutes and I had to cut the call because I don't know was she was doing because she didn't advise of anything, this is appalling service.