A game maker

It also depends if they are still supporting that game or not, Companies eventually do stop supporting games and updating them so they can focus on the newer games.

you could search on
Bing to see if they have a complaints department or the address of their head office.

Do you want to do some legal procedure? Or you can also make your complaint on social networks, sometimes companies respond to you.

You would want to find the developer's or publisher's website to see if they have any available ways to provide feedback to them.

As mentioned above

The specific game you're not satisfied with or need help with, look up the developer and look for their support contact information. If you'd like to tell us which game perhaps we can offer some support or more information for you.

Unfortunately sometimes with games we are disappointed and have to accept it and move on. Other times it could be a long term fix that requires several patches particularly for beta or game previews early access. But regardless you should still provide your
feedback to the developer