No number porting for our business

Our business took out a few new contracts from MTN business online. The process was fast and easy, but once we received the new phones and contracts, we were told that we won’t be able to port our business numbers. We were never told that once we received them, we won’t be able to keep the original business numbers. The MTN lady we did the online process through, never mentioned this to us. So now we have a few thousand rands worth of contracts, but won’t be able to use them, as we cant afford to redo all the signs, business cards and flyers just to change the business number on all of them. The MTN lady says she is not responsible to tell us beforehand that we would not be able to keep our original numbers, can this be? How were we supposed to know this, if she never informed us of this? She just says sorry, but it is what it is. MTN please help us to fix this mess, as there is no way we will reprint everything just for a new number. There has to be a way for us to port the business number over to MTN.