declined credit card

Ive app**** for a credit card over the phone 3 weeks back and i was told to send through the documents of which i did. The lady told me that it has been approved and take 3 to 5 days to be delivered and ive waited until i decided to call them last week and the guy checked for me and told me about a credit card i had with them in 2006 and was handed over to legal. i called their legal dept and it was confirmed that the card was closed.i was given a letter and i sent it through. yesterday i called again to check if it was received and they confirmed and they were buzy with my application. All of a sudden today morning i get and sms saying my credit card application was unsuccessful. No one calls to explain or whatsoever. im not happy with their way of dealing with things. I deserve an explanation as im waiting for the credit card which was approved and now i get an sms instead