Mtn Billing Incorrect once again - Overcharged

I called the call centre on 21/09/2015 and spoke to Nompumelo - Ref Number: ***. I upgraded my contract in June/July 2015. The premium I now subscribed for was R349.00 incl vat per month. In July my premium came to R534.11. When I called Nompumelo, she checked the billing and explained that the Recurring SMS Dundle 300 for an amount of R39.47 should be removed as it was incorrect. I have now pulled out my billings for July, August, September and October and this amount still reflects on my billings. I am upset that after holding so long for a consultant and discussing my query, I still get an incorrect Billing from Mtn. The Itemized Billing from Mtn is not user friendly/ simple and can easily confuse a consumer. I request Mtn to immediately rectify my itemized billings and provide me with a refund. I sincerely hope they check their Itemized billings as per the contract the clients sign up for and re-frame from overcharging the consumer.