No complaints process in place with regard to third party.

I am a concerned customer and very unhappy today. One of SA's biggest cellular companies they do not have a complaints process. I am struggling today with a third party they have appointed which I must contact for their sales contract with Mtn. No one can call me back or let me talk to a manager. After 2 decades with this company it's sad to have experienced my first compliant and dissatisfaction I have with them. Please call me .