If you've tried to reach them, and your agent, and neither are responsive at all, you may want to contact the local Realtor Association or state licensing/regulations department that issues, renews and oversees real estate licenses.

There are regulations about how long need to live in a primary residence before you can qualify for another primary residence mortgage--it's usually a year.

When that has been issued and the problem still occurs you could pursue other more extreme measures related to removing them from the property (per your local regulations for eviction/non-renewal/etc) or charging a fee if it's allowed.Finally, have you read through your local landlord/tenant laws?

According to the NJ government website, the tenant can except in certain circumstances (eg emergency).

It allows some regulation but no bans...

Read up on RCW 58.17.140 for the Washington State subdivision timing regulations.

The rules and regulations with Township and HOA are pretty lenient.

Say informed on current trends, rates and regulations.

Buy a 4family unit and rent it out; or even rent to Airbnb if it's allowed in your local government.

MOST of my REI decisions (decisions to buy or sell a property, for instance) are governed by specific characteristics of the property itself.