Mtn just declined me for no reason!! They should close down there business!!!

I just got declined by MTN now and they couldn't give me a reason why. On the pre approval system shows that I can qualify for a decent device but instead they declined me.. Why? My credit history all over is very good but yet this happens.. this is not the first time I am complaining about this and MTN replies to you back with a automated response system!! This is super frustrating for me and my advice to the people is not to do business with MTN if you want problems in your life go with Mtn!! I honestly think they should not be in business!!!