sim swap

I lost my sim card late december last year and because it was on a top-up 100 contact I didn't want to make a sim swap due to the charges so wanted to cancel it first. I finally got it cancelled end of march, I contacted mtn customer service to do a sim swap but because I didn't remember when last I recharged it I had to make an affidavit with a copy of my ID and was told it will take 24hours for the sim swap to be done, I did fax it through on the 1st april at 12:00pm to *** I called the next day was told to wait an extra 6hours and at 18:00 it will be done, called at 19:00 was told to wait after midnight, I called back on the 3rd april after 8pm and was told it will be done, I called again on the 4th april only to be told they never received the affidavit and the copy of my ID, but on my side it showed it went through successfully. Why do I have to struggle like this to get a simswap because i know every thing that's needed except recharge date and I hardly recharged that sim because I was getting airtime everymonth, can I please just get my old number which is *** I don't think that's asking for too much