It's unlikely that ptsb will take any action on this unless they think that you have money.
However, you still owe the money.
If you have no other assets and a low income, then you should approach ptsb now and try to get their agreement to write off the shortfall. As you have reported a small inheritance in a separate post, you could use this to settle the shortfall in full and final settlement. Then you have a fresh start.
Alternatively, you could seek bankruptcy or personal insolvency. If you do this, you will have to make your recently received inheritance available to your creditors.
Brendan