Can a bank sue you if you making montly payments to your credit card?

I recently got a call from Metropolitan Credit saying I would be sued if I didn't pay off my visa immediately. The amount was 7, 300. I didn't realize that I hadn't made a payment since August. But recently I made some payments and got it down to 6, 500. Will they actually sue if Im making payments, or were they just trying to scare me into paying it all off at once.