Tanants are not answering my calls

[Gabriel Benavidez]

Im having problems with getting in contact with my tenants they do not answer my phone calls or open the front door when i go over. they owe 1400 this month and they will be owing 1500 on the first of july. Im planning to leave a note affront of their door and see if they read it and give me a call back. What are some other things i could do to get in contact with them?