Inherited tenant filed a complaint on me...

[Cody Benedict]

Hey everyone, this is my first post and mostly looking for some reassurance and to see if anyone else has dealt with a similar situation. 

Background: I purchased an off market 4-unit in Wisconsin and inherited 3 tenants. One of the tenants has been there for about 9 years with the last written lease ending in Oct of 2012 (with the owner before the person I bought it for). The previous owner kept her there on a verbal month-to-month lease.

I checked with a local attorney and was told the laws required me to give a 28 day notice to terminate tenancy which I hand delivered (Nov 1st) and told them that we would not be renewing their lease at the end of the month so they would have to move out so that the unit could be remodeled. She initialed the notice and I took a photo with a time stamp as well. Basically she had been calling and texting me to ask questions about the notice and why she was being "evicted". Multiple times I have explained that this is not an eviction and isn't something that has been filed with the court system. 

Now today I received a phone call and email from a Consumer Protection Investigator-Mediation Unit letting me know she filed a complaint and saying that I was evicting her... and I have 10 days to get back to the investigator explaining my side with supporting documents. 

I am currently waiting to hear back from the attorney I was speaking with at the beginning of the month but being a new landlord this has me quite stressed out. 

Thanks in advance for any insights/motivation.