Conned into upgrading

Hi, I received a call from a black lady that told me that she is calling from MTN wrt my upgrade. I told her I usually upgrade at Signet terrace MTN branch. She said that she will offer me 100 SMS and minutes, for R135 or R139. I told her i don't want a phone as i will upgrade later. I know when you upgrade period is over MTN contact you and you are charges less because the 24months is over and charges will only be for the package which was previously on the contract, thus lowering your premium , I thought this was that until I received SMS stating that my upgrade has been sucessfull and that my next upgrade is in 2020. Why will i pay this amount without a phone, when I can get an upgrade with a phone. I have been with MTN for the past 25 years and had no problems, Why has this company conning people, oh, she spoke so fast that I could not understand, and she told me that what ever she said , i will receive an email to go through it policies and procedures. that has not been done to present. Summer Sun if you are so concerned of your reputations, get rid of this employees that has conned me. Is commision so important to her, that she stoops so low. Listen to the recording that she has advised me that this conversation is been recorded. Basic - I need my upgrade cancelled asap, as i will upgrade directly with MTN as I usually do.