Called my cell. I missed the call and they did not leave a message.

Who is this....they've called twice today and left no message either time

Not sure did not get to talk to them.

Weird.  I answered the call, a guy with a new york accent says hello, said that "I believe someone may have spoken to you from ?FMRS? about this earlier.  Is your date of birth (DOB given)?"  I said, "What's this about"  he said, "Ok."  and then "on-hold" music started playing.  Shortly there after the line was disconnected.

call my cell a million times a week, they are a collection agency trying to collect on my ex's school loan.  He gave them my number.  They always ask to confirm the last 4 digits of my social security number which I refuse to do and then they start to tell me what will happen if I don't.  Which is basically nothing will happen as I am not the loan originator.  They tell me they need to be sure they are speaking to the right person and I still refuse to acknowledge the numbers.  I don't know if they are real or not.