Number *****ing and Refusing to cancel

Last year Nov/Dec not too sure of the date, I ported my Vodacom number to Cell C at a Cell C shop in Pinetown. This year 2017 around April/May, I started receiving R50 airtime beginning of the month, I then contacted Cell C to find out but they advised that they do not have access to my sim card information as this is with RMCS and I should contact them directly of which I did and they told me that because of my Edgars account or some story thereof I will be receiving the R50 monthly, I then advised them that I do not have an account with Edgars or Jet as a matter of fact I do not have any clothing account and therefore want this to be cancelled and my number back to Cell C. I have called RMCS almost 4 times to get this done but till today nothing has happened. This is such an inconvenience because I am not able to access Cell C's offers in terms of data due to that. Can somebody please cancel this RMCS for me or else I move to another network that will not sell my number to an external provider.