MTN ESIM conversion from old system to new system

I recently bought a new Samsung galaxy Flip 5G phone, it has a normal sim slot and an Esim embedded. in want to convert my ezim to my cell number but because I am still on MTN old system they cannot do it, i have been waiting for a long time and nobody can tell me when I will be changed over to the new system. i am must carry 2 phones around with me because i have 2 numbers. i want my esim on the phone to be covetred to esim and then use the sim slot for my other number. can someone please ssist?