wrongful billing

I would like to know when am I paying just the upgrade amount for my 2 contracts. Why is stuff appearing on my contracts without my approval? Why is Vodacom not using otp authority with contract owners? I’m getting billed for stuff I didn’t app**** for. The other night I was billed for 2gig recurring on my wifes number while she was sleeping and her phone was in charge in the living room. That is ***** and it happened more than once already and every time I must pay. My wife pays what she needs extra with her card. Now there is a google play R1200 bill added to my account from her number but she pays with her card. I want to ask management to please put a lock on my contracts as I am a pensioner I cant afford the charges and bills just popping up. I never had this problems before the upgrade why now? I also got a R10 50 meg recurring thing on my bill funny thing is I mostly use home wifi for data more ***** taking place because I never bought it. If this don’t stop I'm going to my lawyers with this and stopping my contracts with Vodacom.

Your help in this matter is highly appreciated Leon.