Breach of contract, debating 2 weeks early.

I received an sms from Absa today saying they are going to debit my account two weeks earlier then the contractually agreed date. When I tried to complain to the call centre I was told there is nothing they can do. Apparently they sent an sms, giving people the option to opt out, however no read receipt of such sms could be provided to me. I cannot understand how this is acceptable. Case no***5 This is completely ethically wrong, under no circumstances is absa to debit my account any other date than what was agreed. I will ensure my account is empty on that day, if it effects my credit score I will rain down terror. Consumer complaints board will also hear from me. Lastly, 25 min call for them to tell me they can't help me, what a joke.