Vodacom - No way to cancel or resolve account queries

I incorrectly purchased a data bundle as monthly, instead of once off on 29 Jan 2020. I've been trying to cancel bundle 6- 8 times over the last 2 months, frequently calling and 4 visits to Vodacom stores, 2 of which I managed to speak to someone by calling in again from the store. I've been billed over the last 2 months of requesting cancellation and each agent tells me they cannot send me a reference or can only send it after the call is done. I've not received any references until today and was told that no one has logged the cancellation to date by the last agent I spoke to today. Once again, the billing remains on my account, until an undefined amount of time with no recourse or way to cancel. Neither the shops or call centre agents have been able to assist. This is extremely frustrating. I previously had an issue 2 + years ago, with my account being confused with another customer, that was resolved after many many requests and seemed to have started again this year, when I started to query the cancellation issue. I've also been receiving that customers statements. This was resolved again , since my last Vodacom store visit, however my account was then cancelled instead of rectified. I still have no way of finding out if that has been resolved. I've giving a 1 star, as zero was not an option.