MTN'S INTERNAL PROCESSES / LEAD TIME STOCK PROBLEMS IMPACTING MY BUSINESS!

I am a business owner. I ordered an S21 with A31 Made for Business L for my sales mobile number. This number after having ported from Vodacom to MTN is now on a prepaid instead of a post paid. No matter what I try I am unable to get MTN to solve its internal problems to get the postpaid contract with the devices to me. This is an awful way to start a business relationship.