Suing the landlord is not something you can do. Since you have notified the landlord of the problem and he has failed to repair it, you have three options. 1) Move out; 2) Make the repairs yourself and deduct them from the rent; or 3) set up an escrow account and place the rent in the account until the repairs are taken care of.
You might also notify the city inspectors if the problem could pose a health and safety violation, which I believe this could.
Michigan publishes a booklet on landlord/tenant rights, which you may find helpful. You can find that, here: www.legislature.mi.gov/documents/publications/tenantlandlord.pdf
Best of luck to you with this frustrating problem!
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