Vodacom internal controls pathetic

Viewed my account, noticed that they have linked an unknown cellphone number to my account. Phoned Customer care (082111), most unhelpful - Onus is on me to prove that this number is not mine. Sorry, thinking of popping into my local police station and laying a case of ***** against the CEO Vodacom. Why should I need to have to provide a ream of documentation for Vodacom to investigate? They already gave me the fifth degree in terms of security questions which I answered correctly so why should I be inconvenienced? Surely I have alerted them to investigate based on my call. Absolutely pathetic to think they can treat a client who has been with them for more than 20 plus years. There mess, my problem.