No new account - no reason why

I filled in an account application online for a new account, and never got any feedback from anyone, I then phoned in and the person said she would check what is happening, the lady got back to me and said that my application was rejected,- I do not have a problem if it is rejected however I asked WHY? and then they said I do not meet the criteria, which I find hard to believe seeing that I have an outstanding credit record and receive a very good salary, - they could not give me a satisfactory answer, I actually lost it completely with the lady because I wanted to simply know what the criteria was that I was required to meet and all she could tell me was that she does not know because it is SYSTEM GENERATED. Now I do not know if I am lacking in intelligence but simply saying that the message is system generated does not qualify as an appropriate answer - or am I mistaken. I even went to the trouble of getting my own credit report to check for anything that could be the reason, Anyway I sent a unattractive email to complaints and head office and still nothing is resolved, I think this is really a poor way of looking after potential customers.