Missing deposit and credit

I've been waiting to get my deposit back from telkom for almost 3 years already I keep calling and keep getting references number after reference number or being told in 48hrs I'll recieve my deposit and credit owed paid back to me I've sent a lady my bank account details copy of my ID and yet nothing month after month I recieve a email from telkom telling me I'm in credit the latest ref no I recieved is ***4 its weird how these company's blacklist you when you ow them money but as soon as they ow you money they get away with it telkom ceo should really look at sorting out there aftersale service that's why so many people are leaving telkom because of the terrible service they recieve...