Wanted to keep my old number on my new contract

I got a new contract from mtn direct, i asked to keep my old number that is currently vodacom, yesterday when i finnaly received my phone and sim after more than a month i phoned the number to activate my sim, after doing that i phone to set my limit and the operator couldnt fine my number on the system becauce tehy have given me a new number, and i couldnt see that its a new number because on the sim it only gives a puk number, since yesterday i phoned several times and nobody can help me they just give me a new number to phone each time, they lady lelisha who did the application is on sick leave and how their system is off since early this morning, i want my old number and dont want the new number they gave me otherwise they must come and collect the phone if this cant be resolved. Im getting impatient now because clients want to phone me and i dont have signal on our farm with vodacom that is why i got the contract with mtn