MTN SUCKS!!!

I HAVE COUNTLESS PROBLEMS WITH MTN AND MY ACCOUNT. MY SERVICE KEEPS ON BEING SUSPENDED AND WHEN I CALL IN I GET A DIFFERENT ANSWER EVERY TIME. FIRST I MUST SEND PROOF OF PAYMENT FOR A CERTAIN MONTH WHICH WAS NOT CAPTURED BY THEM THEN I GET TOLD THAT I WAS DOUBLE BILLED ON 1ST MAY 2020 WHEN MTN CHANGED THEIR SYSTEM. I HAVE EVEN BEEN IN TO THEIR HEAD OFFICE ON 14TH AVENUE. NOT ONE MANAGER IN SITE. I WAS GIVEN AN E MAIL ADDRESS OF THEIR BILLING MANAGER TO CONTACT. I AM STILL AWAITING A RESPONSE FROM HER SINCE TUESDAY!! TODAY I RECEIVED A THREATENING SMS AGAIN. THEY HAVE SAID I MADE A PAYMENT ARRANGEMENT WITH THEM WHICH I DID NOT. HOW CAN I DO THAT WHEN THEY CAN'T TELL ME WHY I OWE THEM THE MONEY?? I WANT TO SEE PROOF OF THIS ALLEGATION. I HAVE PROVIDED ALL MY MONTHLY PAYMENTS TO THEM WHICH I MAKE RELIGIOUSLY EVERY MONTH WELL DUE BEFORE THEIR DUE DATE. NOBODY CARES!!! MY STORY IS BEGINNING TO READ LIKE A NOVEL. I NEED TO GO IN TO MTN AND HAVE SOMEONE IN AUTHORITY LOOK AT MY ACCOUNT. CAN SOMEBODY HELP?????