Declined my application without giving a reason

I app**** for an advertised tablet with data contract package online and once I filled in all the forms I was told that my application was declined. Being very confused as this has never happened to me before and my credit record is exemplary, I went onto TransUnion to check that nothing had somehow spoiled my credit. This confirmed that my credit record was showing as very good so I forwarded this back to MTN to get them to double check my application. Once again they declined me and this time when I queried a sales consultant, I was told that it was declined for \business reasons"and that she could not tell me what these business reasons were. As far as I'm concerned this amounts to MTN failing to deliver on advertised products."""