Just when you building clear credit record ,Cell C letting me down big time.

It bad if you tried everything to avoid hampering credit record and cutting off service I paid for.I had zero balance in my account consulted cellc in advance and to request to make debit first of month rather 29 at waterfall branch which assured I am safe they will double debit next month, next thing I get a notification I am in arrears or face negative credit record.Okay, I pay and send proof of payment and call cell c support 3 times which assured again that I am safe since I sent proof of payment, Now what should I have done if I get another message saying my account in suspension row? Basically nothing