Vodacom Refuses to Take the Details they Requested

Vodacom has been e-mailing me some time now to request my updated credit card details. Today I got a chance to phone the call centre, and spoke to Yamkela. She refused to take my credit card details and failed on more than one occasion to listen. She then tried to transfer me to someone else. All that happened was I ended up holding for the Collections department with no response. Even though my account is always in credit, I still want to give Vodacom my updated credit card details, especially as Vodacom keeps asking for it. This should not be difficult to do.