Bad service and incorrect deduction

I took up a new contract with MTN for a cellphone and airtime for R79 per month. This took up total bill to R158. December debit order was correct, then came November with an amount of R201.90, now it is R703.51. I called and spoke to 3 consultants today with no one able to give me a correct answer or solution. One consultant stated that i have made use of the data and airtime over and beyond the prescribed amount issued to me. This is the worst **** that i have heard as i have not made use of the sim card containing airtime as yet nor have i used my data as yet again i cant connect to the internet. After the consultant informed me of this and i responded with the above, she rudely dropped my call. I since have not been able to connect with any consultant again. <br> <br> I am so over MTN. I have reversed the unauthorised amount deducted and have placed a stop on my account until they have rectified my query as they have always received payment on time for the past 3 years yet no service rendered on their side.