Vodacom **************** Again!!!

I've reported to Vodacom in January 2020 after receiving an invoice that there was some irregularity on my phone whereby I get charged for data that I didn't purchase. Then Vodacom reversed about a R1000 with a report that they couldn't pick up where or what activated the data bundles and that they had cancelled the data bundles. This month's invoice is a problem again whereby there's some data bundles charged for amounting to about a R1000 again. After numerous calls through to Vodacom's call centre and their back office I'm now told that the data bundles have been initiated through a vodacom app and that they are not going to refund. I haven't used the vodacom app in over a year but Vodacom all they can do is not to listen to my explanation nor investigate what the problem might be but instead I'm told that the charges won't be reversed. I even requested to take the phone and the sim back to vodacom so that they could investigate but Vodacom doesn't want to. I'm now forced to pay an additional R1000 which i dont have and will just carry on monthly without Vodacom doing anything about it. It's a real shame since I have multiple contracts with Vodacom and have been with them for over 10 years. Why can't they take their phone back if they dont want to look into this matter, if it's a mess why should I be the one on the receiving end??