Vodacom packages and their agents

Have had a very frustrating time with unsolicited agent calls from Vodacom wanting to give an upgrade and informing the customer that their current package is discontinued. After many minutes of discussion, debate and review of the minimal options - and informing you that the call is recorded, they want you to confirm your id number over the phone. This is a risky thing to comply with under the current ID theft environment. If you do not give the full ID over the phone, the agent states that she is unable to assist telephonically and that the customer must now go to a physical store and pay a change package fee to change to a new package, as a result of the discontinuation. Crazy!!!