Can I track a phone by number?

So I lost my phone a month ago or so and I tried calling it and no response buy recently I called again after I got s new phone and new number some lady responded saying who is this and I responded saying this is my phone and I described it and she said if it's your phone come find it then and hung up. I tried using find my iPhone and it says offline. Not sure what to do

I suppose you could report it to Apple or your phone network who MAY be able to lock/brick your phone.
After that, not much else to do.