Sim Swop complications with RCMS

I had a MTN sim card which i bought years ago as a prepaid sim. Opened an account with Edgars and they offered my R50 airtime every month for R39 and i agreed. Recentlry i lost my phone and went to an MTN shop to do a sim swop but they tell me my sim is a contract and they cant perform the sim swop i must go to edgars directly. I went there stood in the long queue, spoke on the phone with a RCMS consultant who said they will call me within 24 hours and that i should expext a letter so i can take to MTN to get my new sim and keep my number but they still havent gotten back to me. Its so frustrating being without my number, if i new this airtime thing was going to turn my sim into a contact and cause so many complications I wouldnt have done it