Bad move. Never close the account, you just reduced the amount of available credit. You probably increased your debt ratio by doing that.
Paying it off is good, but NEVER close an account....
this was an account i opened specifically because it had a 0% apr for balance transfers for 12 months. I opened it, transfered the max amount (2500), then payed it off and closed it before the interest (retroactive for the previous year) kicked in.
plus, if i had another CC i'd be tempted to use it