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If you aren't under a written fixed term lease, then you are legally considered a month to month tenant and the landlord can change the terms of the tenancy agreement with a one month written notice under Michigan law (Mich. Comp. Laws § 554.134)
So if they haven't given you a written notice at least one month long, it is not legally effective to increase the rent.
They would have to give you a notice that gives you at least until Aug 1 if you rent is due on the 1st since the notice requirement requires one month from the date rent is due.
As an aside, in addition to being an attorney, I have also been a landlord for over 26 years...