Frustrated parent

I have a contract with cell c and took out another one. Requested the new contract on my nr and the old one on my sons nr. I already paid all the costs in August but still struggling to get the contract on my sons nr. The feedback I'm getting is that the nr is lost in the system and at least he can use both the sim cards. I didn't pay all those money for him to switch between sim cards when he needs to use his phone. The lady at the store is trying to help with no help from her head office.