MTN EXCESSIVE BILLING QUERIES

I have been a customer of MTN for over 20 years. For the last 2 years alone my monthly bill rarely exceeded R1100 EVER. On my new contract that i took out in November 2015 i was aware of my sub being slightly more expensive and my bill then averaged R1200 with approx R3000 worth of unused accumulated talk time and a ridiculous amount of GIGs accumulated data!. Fist spike in account was April 2015, bill went up to over R2000, I queried this, was told thats just the way it is. Funny enough - May 2015, my bill went back to the normal R1200. Then for June i got a bill for almost R6000!!!!! i phoned customer care, 808 and 809, which NEVER GETS ANSWERED. Finally went to MTN Store in Cedar Square, lady reported the query to billing dept 19 June, stating that she has had MANY CUSTOMERS complaining about excessive billing recently. i have a debit order running and want to get a report regarding this BEFORE this amount gets deducted, however we have not had any form of feedback from MTN billing even though 'apparently' the query has been escalated daily for the last 3 days! MTN NOT ONLY HAS THE WORST CONNECTIVITY BUT ALSO HAS APPALLING CUSTOMER CARE SERVICE!!!