Changing to another network

2 cellphone numbers registered at vodacom. Can receive calls, do everything, except call other people with both numbers. I phoned the vodacom call centre 4 times, did all that they suggested I must do. Even tried the sim cards in another phone. Then after 5 hours they can not find a problem and I need to go to a vodashop now. Been a customer for 18 years. Did tell the vodacom call centre that I am going to swop to another network, their answer was, its fine. Excellent service (sarcastic).