How do I get the phone numbers of the owners of the properties?

Since then I have located the area where they entered and sealed it off, however I'm having trouble killing the ones currently living in the attic.

If they can't do that, keep shopping.This may require digging up the foundation, sealing it from the outside, and installing a french drain to keep water away from the walls.

Not sure if they called off the sign, or if they still have the listing up on their phone and find the number to call from there. 

Hudly Title Phone: (512) 400-4210

Prohibited offsite booking activity includes, but is not limited to:   Providing contact information prior to booking (phone number, email, website, etc.) 

What happened is i was flagged enough that my phone number was shut down.

I went with Vivint.com they have a great smart home system no wifi needed, streams on your phone in real time anywhere you are, tamper protection, security alerts and motion detectors and will notify policy if you have a break in.

They purposely do not have any means of speaking to someone live over a phone.

I currently run a couple of mobile phone stores.