Bad service,

I have been a telkom mobile client for a while and i recently took out a phone contract with them i was told to choose a date for my account to be debited and i chose the 20th which is the date i get payed but telkom debited my account on the 19th and there was no money in my account so the debit order bounced which gives me a bad credit record. I have worked very hard to make sure i payed all my debt on time so that i maintain a good credit record. When i called telkom to tell them the reason i shoose the 20th as my debit date is that i get payed on the 20th and to ask why my account was debited on the 19th. I was told that my query would be escalated and a manager would call me back. I called on the 19th and twice on the 20th and i still have not received a call from telkom to sort out my query. I am very disappointed with the service i got from telkom.