Poor service

I have been calling Cell C for three months now regarding my debit order. Each time i will be advised that the debit will go through, and it ever goes. I have to make manual payments and by then it has already repotted to Transunion that I have missed a payment. This has affected my credit score and it is still not sorted. I called again on Saturday as they did not debit and was told the same thing as always. Maybe is because is a weekend it will go off on Monday. Today is Tuesday and still nothing. i am so tired of calling every Month for their failure to debit my account and now i have decided to sit and see if they will debit or they will keep sending me SMS saying my account is arrears. All cash deposit takes up to 3 days before the could reflect. I am not going to make another cash deposit after all my efforts, i have been on calls and branch with the same issue.