Telkom didn't debit and now I'm stuck in arrears

Last month I noticed that Telkom didn't debit the monthly instalment due. I went to the waterfront branch in Bloemfontein and asked why, the lady told me that the system says they did debit. This month again they didn't debit and I called the same branch. They told me I owe last month and this month's instalment. I asked why I was told that I don't owe anything when I went there to find out why they didn't debit and they have no idea why. Instead I was told that they debited on the 24th of April and reversed because there were no funds, but they were supposed to have debited on the 25th! I asked the lady I was speaking to on the phone to check for me when is the day that was set to debit from my account and she said the 25th of every month, I then asked why would they then debit a day before the 25th,again she said she didn't know why! Again I app**** for another contract three weeks ago and they keep making empty promises. Everyday they tell me they don't have stock for the past three weeks. I work for Capitec Bank and we are very sensitive to service delivery. It's heartbreaking to know that other service providers treat their clients this way. I'm very disappointed