BAD BAD SERVICE!!!

What do I have to do to get a response from MTN .<br> I have had an issue with my billing on my one contract and to date, I am STILL waiting on assistance!! <br> My contracts with MTN are at a rate of R1067.01, however:<br> I was charged R R3287.08 for the month of November 2015<br> The problem is on the one number: my LAST SIX BILLING PERIODS was R299.00<br> And for December:<br> 13/12/2015 PACKET SWITCHED DATA CALLS 1947.43<br> 13/12/2015 PROMO SERVICE FEE 219.30<br> 13/12/2015 BROADBAND 500MB SUBS FEE 42.98<br> 13/12/2015 Self Service Transactions 0.00<br> TOTAL EXCLUDING VAT 2209.71<br> VAT AT 14.00% 309.36<br> TOTAL R 2519.07<br> I was the one who tried to make first contact with MTN and NO ONE responded!<br> I asked for the Call Data Records for data usage:<br> Received it on the 23/12/15:<br> Invoice 2015-12-13 total data used: 3249.44MB<br> 3249.44MB - 1000MB (500MB monthly allocation and 500MB carry over bundle)= 2249.44MB X R0.87 (out of bundle rate excl vat )<br> R1957.01 ( excl vat )<br> I only switch my laptop on three times and wasn't on the internet for long, so how is it possible to use 1000 mb in three days!!!. I also didn't do any updates!!<br> I stopped my debit order in December 2015 and will not make payment on m