Disatisfaction with the service rendered

I would like to share the dissatisfaction for service rendered by the service provider. I use internet in order to keep my business operational, I ordered the router and sim on the 19th of December and the order was delivered on the 21st of December, I've been trying to activate the sim card from the 21st to date, after the numerous calls with them I was advised to put the Sim card on the device to date I can't work, I spend an hour holding on their lines and they get cut, I'm so frustrated . I've been following up I was then told that someone from MTN will contact me, and no one has made contact as yet