Incorrect Billing and unpaid Debit Order

I have complaints regarding the following: 1. Incorrect billing (initially R580-00pm as advertised but on receiving the first bill the total was more than a R1000-00. 2. Debit Order arrangements were made for the 9th of every month, but Telkom allows the Debit Order to go off different dates of the month. 3. On the 11th August 2015 Debit Order went off, came back on the 12th as rejected due to insufficient funds while there were funds available. I receive regular messages that my account will be suspended from Telkom, despite the fact that they did not stick to the agreement with me. I feel Telkom can phone me to sort out this matter but to no avail. TELKOM SERVICE IS PATHETIC AND NO FOLLOW UP FOR IMPROVEMENT IS BEING MADE TO RESOLVE THESE TYPES OF PROBLEMS!!!!!!