Have you told the window company that you are unhappy and why you are unhappy?

It would help if you posted a photo. If you didn't like the way they looked, why did you install them?

It sounds like the grills are sized so that all the windows have a similar glass size. When you purchase windows for different size window openings, you do have to check out how all the different sizes will look. You may like the window in certain sizes and not in other sizes.

Maybe you should have asked some questions. Maybe the contractor should have brought up the proportion issue.
It's doubtful Marvin will step in to fix a problem of other people's oversite.
You will either live with the windows or replace them at your cost.
Ron

Ron,

I am kinda sure that Marvin won't step in to fix the problem since the windows are MW... ;-)

I have never authorized a window order without the customer's signature on the grille configuration.

Now you know why. :)

Michael