Cell C does not want to migrate my accounts

About a year ago I migrated one of my voice line contracts to a data line. Never did anyone tell me that it is not allowed and that they are doing that as an exception for me. I called Cell C customer care on Saturday, 16 April 2016 to request that my two contracts which can be upgraded according to the consultant at the call centre, be migrated from voice lines to data lines. The person who helped me said that a request / enquiry will be logged and someone from Cell C will call me within 2 working days to confirm that the migration has been done. A consulted did try to contact me on the Sunday, but I was busy with a cricket match. I called back on the Monday, but the person who helped me said she will log another request for a consultant to call me. On Tuesday an consulted contacted me but was very rude and just said that the migration cannot be done and the previous migration they did was an exception because I also reported them to Hello Peter back then. I requested to speak to a supervisor and the lady said that her supervisor will call me back. I have not received any calls to date. Please resolve the matter for me and request Cell C to attend to the migrations asap.