Vodacom failing me

I have called Vodacom 3 times, regarding irregular data usage on my number; today they advised that it is Amazon data being used on my account. I do not even have the Amazon app. And Vodacom is taking zero accountability or even trying to assist with is discrepancy :( This must be a Vodacom-related issue, because my previous ISP did not use this much data and I always had data left at the end of the month. My Windows and iOS settings are set to not automatically update apps and software, and the only iOS backups and i think it's possible to have over 10Gb within an hour