Unresolved billing issues

I logged two billing queries with MTN and have been getting nowhere with resolving these issues for over 3 month.<br> The first was for billing anomalies pertaining to one of my contacts where airtime minutes paid for was less than utilised before being charged for airtime while at the same time the data usage did not appear correct, this call was logged for the first time on 28 July 2015 and the only response to date was it is correct although I have questioned this again and there has been no proper communication.<br> The second issue raised was for upgrade charges levied against three upgrades where the charges were supposed to be free. This was logged on 25 August 2015 and to date only one of the upgrade charges have been credited with the remaining 2 still outstanding. When last contacting the MTN office at The Campus in Bryanston it was promised that the upgrades charges would be rectified by latest 30/10/2015 and would be processed and deducted from the next payment on 01/11/2015. The payment went through on 01/11/2015 without the upgrade charges credited.<br> Lack of communication and willingness to resolve issues is totally unacceptable.