Retention sucks

I have been a customer with Netstar basically since they started. Every time I have had a new car (12) I installed a new unit. The problem started when I got my new car on 26 June. First the retention department was involved (Bianca) that insisted that a new contract must be opened. The to state that I am lying about the payment on the monthly fee. Not sure how this can be as I had the bank deduction notification with me. No installation certificates could be provided for me when the unit is installed?????? Then their is a issue that I have a personalised number plate as this can not be carried over to the new.car. I e-mailed an enquiry on the Saturday. Up to day I have not received anything he following Monday I phoned the main office. Their I was transferred from one department to the next quiring the increase of the monthly fees as well as to get the proof installation. After 1 hour I had the proof of installation. But still no joy. Informed that due to me purchasing the unit outright and paying a monthly fee I can not qualify for reduction in fees! Now I am informed that a deduction double my monthly fee is been deducted!!! Must say this is one way of trying to retain people.