Contract subscription changed without my consent

<p>I signed up for a router deal in December 2016 at a Makro store for a My Gig 10 at R299. All went well for the first three months with my bill coming at R299. Then all of a sudden in April I was charged over R3000. Same for May and then June and by July we had that mess sorted out because I was apparently on an open line and had no idea. Fast forward to August when I receive my bill I am now being billed R499. Upon claling the call centre I am told that 'someone' deleted the R299 deal and replaced it with a R499 deal. HOW VODACOM???????????? I was advised to go back to the Makro store where I signed for my contract but my question is, if the advert was for R299 and I was charged R299 for 3 months, at what point did we move to R499?????????? This is ridiculous. I want answers and I want to know how deals just get deleted and replaced without an audit trail to show who deleted what and why.</p>