Bad customer service from Fonechoice

I had the worst experience with these people. I have been handed over to a debt collecting agency called NRB risk solutions and paid them R6100 as I owed R11 000. Yesterday I got a call again from Credit Works saying I owe Fonechoice R11 00. I called NRB again to inform them about this as Ive made arrangements already, they advised that Fonechoice took the account from them and that have given the R6100 that Ive paid to Fonechoice. I tried calling their legal department but the phone keeps ringing and no one can help me. Im frustrated cause Im being ****med to pay more money at different companies. Not sure what to do!!!!!!!