horrible service delivery mtn

January the 30 a debit order had bounced from my account of R399 of witch i then went and transferred into my account there after expecting either another debit order run or for me to pay it to Mtn itself i hadn't heard anything from mtn so i immediately assumed that the debit or had been rerun and taken off of my account on the 23 of February i received an email stating that i owe MTN R410.40 and my monthly debit is supposed to be R399.00 i called mtn on the same day to query why must i pay the R410.40 only to be told that my account is up to date and mtn actually owe me R100 as said by the consultant. on Saturday 28th of February a debit order of R824.39 was taken off of my account without prior arrangement or notice so i called mtn again on the 2 of march to query why this amount has come off cause i didnt authorise it and that i was told mtn owed me R100 the consultant began to get shirty with me and told me they had sms'd me (on a sim card that is not used) i had no phone call or email about my account that is not upto date to me im in sales if a customer missed a payment let them know to either rerun the debit order or give them banking details i will be looking at canceling