unprofessional and inconvenience caused

I have a contract with Vodacom since August 2014 and a debt order was set for the 20th of each month. 5 months ago the debt order wasn't taken and I did not notice my account was blocked and they had to double debt me the next month. 3 months ago they didn't take it again and lucky I noticed when I called the reason was there is something wrong with my account but mtn Standardbank and other took their debt order with no problem and I work in the bank so I know there is nothing wrong with my account. Last month it didn't take I had to leave work to go pay Vodacom before I had problems I called in and was promised by the accounts department that this month it will go off with no problems , today is the 22 and still the debt order is not off when I called in all I was told was no we can't help you please wait for 8am to call our account department even when I explained that my day is busy vodacom is vodacom they should be able to pass my problem to the right people Kim the team leader of general queries said please call them at 8 as they open at . Apparently if she helps me it takes longer.