Bad service

Telkom is failing to assist me with my number that I ported to them from Vodacom to receive calls. I'm stuck with this number as I'm under contract and the number doesn't take incoming calls. Everything is fine just the incoming calls. I was advised by their consultants to do swim swap which I did and the problem is still not solved. I have changed phones and ran all the settings as advised by their consultants with no help.

When I answer a call it drops. Please help me Telkom.