I spilled Min Wax dark walnut stain on my wall to wall carpeting.

Ooh I am sorry . I don't know if anything that will take that up without ruining carpet anymore. I would probably email the Minwax company on that one make sure you can tell them what type of carpet you have. Good luck

https://www.hunker.com/13422889/how-to-get-minwax-stains-out-of-carpets

If you have a shop vac, I would soak the stain with water if it is a water based stain, and use the shop vac to pull it out of the carpet. If it is Oil based, you will need to use some mineral spirt to clean it, just be sure that it doesn't dry on the carpet. If you use any paper towels to clean up mineral spirits be sure to soak them in water and place them in a bag and take to a hazmat facility to properly dispose of it. mineral spirits can self ignight and case a fire

If you use mineral spirits to clean be mindful a anything that could spark -- like the motor on a shop vac better to clean it up with rags. Also do not bundle used rags in the trash lay them out and let them dry.

Walmart sell stain remover Zout and it should work.

Insurance claim?