upgrade problems - overcharged twice and no data

hi<br> <br> MTN did not upgrade my contract correctly, resulted in overcharges, no re-imbur*****t 3 months later. no data received after the upgrade for month 2 and 3. still awaiting 2 months of data. debited my airtime for data as a result.<br> <br> i have emailed the corporate business global list, Omar, Jenna, Thapelo and called the call centre numerous times the past 3 months and to date nothing has been resolved. <br> <br> i am feedup with the pathetic service from MTN staff. <br>