Bad Service

I log a complaint a couple of days ago regarding service failure and fact that Vodacom haven't credited my account . I request Vodacom to cancel my debit order and opt for EFT payments . Vodacom still deduct money from a close account and then bill me R 100.00 for each unpaid . I guy called me on Tuesday and told me that they will fix the problem and rectify my account but since yesterday I get SMS from VODACOM that my account is in arrears and they will suspend service . I spoke to Palesa from Customer care and she confirmed that my account is still in arrears. I made the full payment on the 20th of March but Vodacom still look for money in a close account just to bill me for unpaid . Surely this cant be legal and Vodacom cant provide me with any proof that I agreed to the R100.00 for every unsuccessful debit order instruction. I await urgent feedback but will ask for a legal opinion in terms of ******* R100.00 unpaid debit order fee . I got a number to cancel my debit order but was advised today by Palesa from collections department that they cant cancel my debit order and therefore I assume that I will be responsible every month for the return debit order fee .See you in court.