You are correct that the FDCPA does not apply to origincal creditors. I would be suspicious of a company that is using spoofing technology, as it's likley a scam. What name and/or number shows up on your caller ID? Do you have any outstanding debts? Have you taken our a payday loan in the past?
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Michigan's Collection Practices Act applies to original creditors - and as you suspect, spoofing is an unfair practice. Although not as generous as the FDCPA with respect to statutory damages, the state statute does allow for recovery of actual damages, double damages for a willful violation, as well as recovery of your costs and attorney fees.