Bad behavior

How frustrating it is that first thing in the morning you get a phone call to be told that you are owing but it well known that the unit has failed approximately 7 months ago and the three appointment were missed no follow up was done what's so ever . Management doesn't return calls at all. Instead credit controllers keep on asking for money but there is no resolution to the problem. Not even crediting my account for the period they debited my account without any service.