ACCOUNT HOLDER

SO MANY TIMES, AS NOW FOR INSTANCE, THEIR SYSTEM IS A NIGHTMARE !! MTN SENT ME ONLINE RO,OO INVOICE TO PAY AND WHEN I QUERY MTN REPLY I AM R 14000 IN ARREARS !!! AND I AM NOT IN ARREARS !! MTN JUST SUSPEND MY ACCOUNT !! TERRIBLE. THIS NEVER HAPPENS WITH MY VODACOM ACCOUNT