Line cancelled due to yellow pages billing

My telephone line was incorrectly billed by the Yellow Pages(Trudon) and when contacted by Telkom about the outstanding amount, I informed them I am waiting for the credit from Trudon and will then pay the remainder of the amount. I went to a Telkom branch today to find out if Trudon has credited my account with the promised amount, only to be told that my telephone line has been completely cancelled. Can someone please sort out the issue