Who called from 3473480611

I put my number on the National do not call list and somehow these jerks are calling!

Continually get these calls.. sometimes they call using a different #.. They call and leave a message but I have no idea what for... I answered by mistake and hung up... they called me back 6 times in a row..  If this is a real debt collector... they need to provide more details on their voice mails.. but from the sounds of it... this is a scam... how can I block their number? any tips?

Have called several times wanting to give me a claim number.  Told then they were a scam and I was not going to give them any information.

Called from FCS on behalf of Fireworks gym he spoke English but not American. Willing to bet he won't call back.

Tried to collect money I did note owe