Force Majeure Clause Invoked | scope creep with no amendment

Looking for advice on a legal issue. Here's what happened.

scope creep with no amendment. I've been dealing with this for about 8 months now and the situation isn't improving.

The contract was signed 13 months ago. I have a copy of the original agreement. The total amount in dispute is approximately $76,000.

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

NAL, but from what I've read, you should check your state's specific laws. Of course teh details matter a lot here.