Tekkie Town Store Card declined and Customer Centre cannot give reason

I app**** for a Tekkie Town store card online. While busy with the application and choose the option to go the next step, I were informed my application was unsuccessful. I contacted the call centre to enquire about the unsuccessful application and I was told it was due to unaffordability and credit record. I am extremely unhappy with this! I had to give my income and expenses on a very low level. The lady could not tell me how on earth I got the message, but I must accept it. I got a very good credit record and surely would not apply if I could not afford it. She said to me I must try again in the next six months, maybe I'm then successful. I'm sorry but I wont tolerate such behaviour towards a client. I tried to understand why my application was declined and I was told to try again in 6months, maybe I'm then successful. If the application form requested my income and expenses in detail, I would have maybe understand, but it is very vague.