Absolutely BAD BAD BAD service

I have been dealing with TELKOM for the past 3/4 months in order to have the correct date for my debit order to be put in place. They keep on subtracting on 19th day of every month eventhough I informed them that my salary date is different (after 19). Now again, it did not go through due to them not having in the correct date. I have been switched off again, I know that the account needs to be paid by 1st of every month but I am so frustrated because of bank charges I have to pay due to them not adhering to my request. I have dealt with 2 people already from Telkom as well as following up monthly, as per their records.