Closing Statement and Close Account permanently

This is my on-going complaint as I was promised that I will be receiving a statement reflecting a Nil balance(no owing balance) as RAM Couriers collected my cellphone and Olga from SRM Department confirmed via email that a credit have been processed to my account. I have also been in contact with the Legal Department as well. I am very upset that Vodacom Debt Collection Department is still contacting persons(people) that I know stating that I have an outstanding balance with them that needs to be settled. I don't know why they are embarrassing me by stating that I still owe them monies. My complaint has been going on for 1 full year and I am really disgusted by the way it was handled.