Pathetic customer service

My contact taken had advises Telkom to deduct on the 25th. I received an sms on the 20/07/15 about my account being debited on the 24th I called Telkom immediately to inform them that there is no funds available&this transaction requires to be reversed. The agent, unknown an rude, informed me that she could not reverse the billing I than requested for her manager and she left me holding for a long time only to advise me that the manager will call me back. I informed her that the debit order must go through on the 25th of after but not before. However, the transaction went through on the 24th resulting in a reject payment & a R115 unpaid charges. I'm still waiting for her manager to call me back a and it is now the 03rd/08/15. The payment was deducted on the 30th and today I received statement informing me that my account last month's bill is unpaid. I require the unpaid charges to be refunded into my account and I don't expect to see any interest due to late payment. Ridiculous and Disappointed!!!