False advertising

I signed up for the black friday 100gig data and I have been approved. I did not receive the e-mail to forward my documents and requested the e-mail address. I received a message after 10 days that I do not meet the criteria. How can I be approved and now I do not meet their criteria. Which criteria would that be after you have been approved? I have already disconnected the old internet as I was told that I will receive my ****le and data in a few days. In the advert the only criteria is that it is based on the credit check and that has been done and I was approved by MTN.