incorrect dates

For 3 consecutive months I've had them debit my account on the wrong date. It can't be so difficult to debit an account on the right date. By the 30th I transfer all my funds to a savings account, my vodacom account gets softlocked because of their incompetency and im held liable with a penalty fee and a waiting period before I am able to use it again. I work in an industry where no cellphones are to be used I chose the debit option to avoid queues and now I have to go into a store to pay the accpunt. I have been with vodacom for many years but I am truly annoyed with this.