SABRE HS-DSA Wedge Door Stop Security Alarm with 120 dB Siren — Great for Home, Travel, Apartment or Dorm Amazon.com
Taytop Portable Door Lock,Travel Lock,Security Device Leaving Home Without Loss,Additional Safety Lock from Inside,Used for School,AirBNB,Home,Hotel,Apartment and More Amazon.com
And the wyze motion detector and door alarms are also a fantastic deal for 25 bucks.
One other thing… See if you can get a friend’s old phone and an extra line on their plan for a few months and only use it with a few select people. See if that helps.
Best of luck!