Disgraceful service at MTN

I have purchased three pay as you go sim cards in the last 10 days. These were rica'd in store and i was told all I had to do was put them into the phone and I would see instructions to get my number. Didn't happen THREE TIMES. I have tried everything to get he;p from their customer service in vain. I have sen e-mails, dialed their helpline to no avail. I am now so frustrated and angry . So sick of bad service and rip-offs