INCORRECT BILLING ON DATA ONLY CONTRACT

I have had nothing but problems with Vodacom since doing an upgrade on 4 June. Firstly an unauthor0zed simswop was done by the back office, then an authorized debit order from my bank account. Upon receiving an updated statement from Vodacom, I noticed that I have been charged and debited for a CLIP service on a data only contract. I have personally gone back as far as I have email statements from Vodacom and this goes back as far as June 2019. I contacted customer care and logged a query regarding this and today I receive an sms advising that the CLIP service has been deactivated and as a goodwill gesture my account has been credited with R208.56 which is only for 24 months for which I was billed this. THIS data contract has been active for more than 8 years which is equivalent to almost 96 months, not for 2 months for which are they are kindly paying me for overcharging me for more than 8 years!!!!!