Who does one complain to if the Complaints Department does not answer your call???!!

I am beyond frustrated! I have been trying to cancel my Telkom line for 3 months and in the interim my credit rating has been negatively affected.. I have made various attempts to get this sorted, but I am just told that I must check in days to come. Today, I am at wit's end. I tried contacting the Complaints Division 5 times today, but it is as if the line is on mute. I hear people chatting in the background, but nobody answers. I am usually a patient person, but I have had enough! Please help!