Settled on cibil - sale to debt recovery company after 6 years

I had settled a credit card amount with the bank for an amount of 16,000 in 2003. The bank has sold my account to a debt recovery company in 2009. 1. Is it legal for a Bank sell a 'settled' account for recovery to another entity? 2. Can the account be treated as time barred in 2009 and hence can the account be sold. 3. Is it legal for the bank to show this on CIBIL even after 15years has passed?