Totally ridiculous

Telkom usually debits my bank account on the last day of the month,however this December they suddenly decided to do soon the 29th! There wasn't sufficient funds as I was not expecting them to debit yet. Another R100 was judged to me by Fnb or Telkom not sure who due to insufficient funds for the debit! Today on the 29th January 2018 Telkom locks my account saying they will debit the funds in two days time and thereafter unlock the account! They also claim to have sent me SMS warning of the above but I haven't received any SMS or email My question is 1)Why can't they debit immediately and unlock the account?Seems like they don't want be to utilize my remaining mobile data and airtime minutes for the month!!! 2)They say if I do a cash deposit to them it will take seven days to unlock the account! It's 2018!!! Unfortunately Telkom seem upto date with the latest trends when they want you to sign up contracts with them but when there are any issues to resolve they seem to be in the nineties! I have resolved to cancel all my contracts with Telkom at the first opportunity and to advice others to do the same!