Premiere Credit Card review: Credit balance

I am disputing a credit card that was charge off many many years ago.
I was approved for a Premier bankcard half a year ago. 400 credit limit. My available credit as of Feb 6, Is 49.00 dollars. I get an email stating that I owe a previous premiere card in the amount of $409.00 dollars. acct ending in 4253
If they knew I had a charge off why are they collecting money from an old account 7 or 10 years ago? why did they approve me for this new credit card. I have 49.00 dollars in available credit