Vodacom prying on elderly

I am writing this complaint on behalf of my mother. She was called by vodacom representatives selling her a laptop over the phone but alot of details were lefte out. She neither agreed to the 2 sims cards that were sent billing her to almost a thousand rands. We called vodacom quering about this and even requested them for the telephone records of which they have failed to send to us as proof. After 3 years my mothers bill is R6000+ they have put her through as a bad payer. She is 61 year old retiree and is stressing about this bill. Its not the first time vodacom has done fraid on her account. Please investigate if she agreed to the deal or not. The consultants have been sooooooo ruuude I CANNOT DEAL WITH THEM ANYMORE. I would like this sourted out ASAP. i would gladly give her details for firther assistance.