unfair treatment from vodacom

i must say that i am not impressed with the service i have received from Vodacom. I have had countless problems after having a contact with them for more than 10 years. recent event was that my debit order was unpaid due to vodacom debited after the debit order date due to public holidays but over and above that they debited the incorrect amount for the 2nd month. when i realized that debit was unpaid i made a payment immediately a week later they have charged me a R 100.00 that is not treating customers fairly i have never had an unpaid and my bank has also charged me for this unpaid debit.