BAD SERVICE

Two months back I had a query with Vodacom regarding my account, and here I am back again, saying that I am in arrears but the same account has been paid each and every month, nothing changed how can I be in arrears. I am have this account for the last 6 months made an upgrade and suddenly this account is in arrears because of short payment How on earth is this possible. People are not trained well to handle accounts. This time no apologies I AM CANCELLING MY TOTAL ACCOUNT WITH VODACOM