bad service

a salesperson calls me and tells me that the new package that I have now since I renewed my contract come with a camera (one of the new technologies that they have implemented to assist with hijacks, accident etc..) need to be installed on my vehicle with no charge. Mind me I had to call them to enquire about my tracker only to find out that it has expired long time ago and no one called me about it I was just on a month-to-month kind of arrangements with no benefit. we then scheduled the appoint for the device (camera) to be fitted only to find out that am now paying double the amount I was paying for the last 6 years. I reported the matter till today no one has called me back regarding this matter but yet they call me every day about the missing payment that I reversed because I didn't understand why so much. never had issues with this company but am now disappointed all I wanted was this to be rectified that's all, but their interest is only on the money in. whenever I call them am told they will transfer my call to customer service all of them they will tell me that they will send an email to the person who is handling this matter, but they won't call me back