I sold my home and put my contract on a deferment,...

I sold my home and put my contract on a deferment, until I my new home was built. Due to the lengthy time of the construction I called and notified Vivint of the tentative dates. Four months later, I get a call from Vivint informing me that my account is four months delinquent. I thought I resolved their mistake until I received a collection letter for double the amount! I immediately called and advised Vivint of their mistake and proceeded to be connected 3 times!!!!... each time explaining their mistake. The last account manager that I spoke with refused to get her supervisor and asked if I could be put on hold, again! She was very smug and she seemed to be annoyed by my anger! This agency has recently had bad reviews and I thought it was too bad, because I had a great experience.... until now!