ZERO SERVICE AT MTN

I have purchased over the past three months, four pay as you go sim cards, rica'd instore. I am unable to get cell numbers out of MTN for three of them. I can't dial out or send messages at all , not even to their help numbers. I have pages of enquiries sent to them via my laptop with zero help. I have even messaged the CEO on LinkedIn. He hasn't bothered to reply either. How does one get to physically speak to an actual live human being at MTN? Are there any?