Debit order issues

I upgraded my Telkom contract on the 17th of April. In the call I requested my debit order date to be hanged to the 1st of each month. It went well for 1 month, then suddenly started having double debit orders on the 25th and the 1st. Because my salary only lands on the last day of the month, the 25th debit order would reverse, causing Telkom to add charges to my account for non collection. Now I'm sitting with a suspended account for "arrears amounts" but my second debit order has gone off each month. The call center cant assist me, stating I need to give them everything short of a blood test so they can track the call. Never had an issue with Telkom, Why Now???