Has anyone dealt with angel investor wants board seat?

EDIT: added more context below. Looking for advice on a legal issue. Here's what happened.

angel investor wants board seat. I've been dealing with this for about 4 weeks now and the situation isn't improving.

I have already tried to resolve this directly but did not get a clear answer.

Has anyone been through something similar? What worked for you?

Oh god, another one of these.

I ended up filing with the appropriate government agency, which cost about $4-8 but saved me a lot more in the long run.

Not a lawyer, but I have direct experience with this.

What worked for me was hiring an attorney to send the initial letter. It took 2-4 months but was worth it.