Evicting a student in Michigan is expensive and time-consuming.

Would this have any affect if they were to pursue legal action if the intended landlord's use of property is not followed within the 6 months?

When the tenant left, I posted it on Facebook marketplace in June for cheap and got a lot of action, eventually settling on a guy who had a construction company who was going to fix and flip.

What are my courses of action here?

It's illegal (See the TCPA - the Telephone Consumer Protection Act) and supremely obnoxious.EVERYBODY hates robocalls, ringless voicemails and spam texts. 

It sounds like you need to take action.

The Consumer Finance Protection Bureau, and the SAFE Act may be applicable to “lease option” on residential property.

Yes you can, here are a couple of links with reviews from a consumer standpoint on how that works, I have never used the services myself but I have looked into it before.Rock the ScoreRent ReportersRental KharmaRentTrackPayYourRent

I have things pretty dialed in, so it does not consume much time at all....maybe an hour a week?  

It would be a nightmare for the seller to have to give multiple 24-hour notices to enter tenants' apartments for people who are not serious about buying the property and it would be very time-consuming for the sellers, tenants and brokers.