My Cell Number Is Not Working Since November

My prepaid cell number ( ********** 749) stopped working last year November. Vodacom advised me to do a sim swap and nothing has changed and each time I had to pay for the sim swap. I did the sim swap 4 time and up until today the cell number doesn't work. What do I have to do the get my number to work again. I went to Northgate Vodashop, Clearwater Vodashop and also called the call center but my cell number still doesn't work.