First Source Advantage debt collection help

Hi, I'm looking for help on how to deal with FSA and repaying my loan. Here's a little history:

I have a defaulted private student loan debt of 14,000 with Chase bank. It went through one collection agency, back to Chase, and now I'm being called by First Source.

I assume either a)First Source bought the defaulted loan from Chase bank for cheap and is trying to recover as much as it can or b)First Source is not interested in payment plans and instead are going to try and sue. Is this very likely?

What would be the best way to try and get a payment plan set up? I'm unemployed but I'm actively looking for a job. And is there anything I can say to stall payments until I find a job?

I'll be asking for everything in writing, but if there is a payment plan set up what's the best way to pay without giving out bank information? Just by mailing a check? Any other tips to dealing with FSA?

You assumed wrong. Student loans both private and federal are not sold to CA's. They do actively sue. And you will not get anything in writing. No CA is going to violate your default agreement in your original promissory note whereby you agreed to balance in full on demand if you defaulted. Standard for student loans.