Debited more than agreed amount

I've been with them since 2019 then last year while I was highly pregnant in October I received a call from an agent (guy) didn't get his name said I'm due for an upgrade they would like to install the new device in my car (2014 Vw tiguan 1.4 blue motion) and he confirmed with me that the debit order will not change but remain the same R231 as I've been paying. Device was installed then in December a debit order ran R495 I tried calling them with no luck sent them a complaint via after done a reversal since it was more than the agreed amount ,then I received an sms threat saying I owe R900 now I'm puzzled how so no explanation none whatsoever. Then on the 18th Jan 2023 received a call the lady said to me they will escalate the matter based on the lengthy conversation I had with her over the phone and I believe that calls are indeed recorded. On the 20th Jan 2023 another R495 ran I reversed and called them same no answer then early this month I decided to go on twitter maybe I'll get answers only to be called back and told that the old device was never canceled which is why the debit order ran with that same amount the consultant I spoke to Palesa explained their internal work flow and even said there was a cancelation now logged for the device to be removed I then told her since this has ruined my ITC they must just cancel the contract she and clear the arrears and we start afresh or they should remove this whole thing, she then said that cannot be done as this is contractual agreement it will still affect me so since it's not account's fault but sales team that department needs to decide and advice a way forward as I told her that I'm not in position to pay for those months now which she wanted me to pay R460 then they will credit the account. Again this hasn't been resolved cancelation not done my ITC is ruined as it shows arrears R1400 and sad part I've been a loyal customer for years but they do me dirty. The same debit order amount R495 ran today off my account.

Is there a way this can be resolved as it seems like I'm busy wasting my energy talking to deaf people who can't simply resolved this.