Over charged for 36 months

RE: Account A***<br> I contacted the support center on the 10th of November 2015 regarding BIS charges on my account (ref nr ***2). I received not feedback other than the automated email with the ref nr. I call yesterday and a consultet confirmed that i have been incorrectly billed (Ref ***)<br> <br> I have not had a blackberry handset linked to 083387***x I had a galaxy s3 since Aug 2012 and upgraded to a galaxy zoom in Aug 2014. I had an additional contract (******) but that was cancelled on the 27th of August 2014.<br> <br> ***: MTN LTE sim was collected on the 8th of May, it is now 6 months later and the LTE sim is still not activated.<br> <br> I cancelled my contract with Cell C due to bad customer service and joined MTN. IF these issues are not resolved immediatly, i will follow the same procedure when this contract is up for renewal.