phone ***** still using my cell number

I would like to express my greatest disappointment as an MTN customer.<br> after many years of being their customer ,was really shocked when I was told my sim that is ****** could not be blocked ,I was then told to get a affidavit and fax it to this number *** along with my id and new sim number,<br> which I did on 15/05/2015 .after doing so I then phoned to confirm they said it takes 24 hours I needed to wait .<br> I then phone this morning 18/05/2015 with the other MTN number I was told to phone with the new sim since they unable to check if im using other number which I did .the lady confirmed that they haven't received my fax I then asked for her email forwarded the stuff to her .Now they need a certified ID copy .I phoned on the 13/05 to ask what they need in order to do my sim swop they never mentioned that the id copy must be certified would have done it when I went to get an affidavit at the police station.<br> someone else is still using my phone still not blocked ,and I still cannot do a sim swop <br> lovely MTN .<br>