Bad service, Vodacom

Vodacom is always asking one a lot of questions to verify one's information which is good for security reasons. But why ask 10 questions and when one cant answer one question, then it is presumed you are not the owner of the contract. They always ask me a Vodacom account number. I don't know it and you get given a run around with your airtime. Their personnel are also very rude. Bad service to you Vodacom with your staff.