Incorrect billing for months and month ongoing

I have changed my banking details in September of last year with Vodacom from my Absa account to FNB. Every now and then my debit order bounces due to Vodacom still using my ABSA account details that does not exist anymore. Some months my FNB account is used and all is good. Then again the next month my debit order bounces again because Vodacom used the old incorrect ABSA account details. I have called so many times the Vodacom call center to update my banking details to my FNB account that I just do not know what to do anymore. Also every time I have to log disputes and calls to reverse the R100 penalty fee. Today again my number and my wife's number was suspended due to Vodacom using the incorrect banking details. I again called Vodacom and they said they would resubmit the debit order using my FNB account. I did not even have to give them any details as they have the FNB details on the system, however they keep using the ABSA details.

I have been a Vodacom subscriber since 1997 with the same number(have never changed to a different number or provider), and this is how I am treated after being a loyal customer for 20 years with numerous other lines and contracts as well with Vodacom.

Thank you vodacom, your "POWER TO YOU" saying really gets new meaning when we as customers have to try and sort out billing problems with you that is your fault and not ours.

Lourens Kruger