Incorrect Debit Order Date

I have two contracts with Telkom. Mobile for tablet and my cellphone. Debit Order date is distinctly inserted on 20th of every month. This is my payday. Then why, breaching my contract, would Telkom debit me on 19th June 2015 instead of 20th June 2015. This has caused my accoun to go overdrawn and i had to pay honouring fees of R90 at the bank. This money is due to me by telkom - and i expect it to be returned within 30 days. I alsodont expect them to debit me again before my required debit date that i have submitted. I expect the R90 honouring fees be reimbursed and an apology given to me within 30 days.