Call the manufacturer to get help

I would get a plastic outty knife and some round plastic kitchen scrubbies. Mix a thin paster of vinegar and baking soda, using a whisk in a bowl, and spread over the foil, and leave overnight...... https://www.hunker.com/12577203/how-to-remove-tin-foil-stuck-to-the-bottom-of-an-oven

I am sorry to hear that! I know you were so disappointed, but there is help. See below please.

https://www.hunker.com/12577203/how-to-remove-tin-foil-stuck-to-the-bottom-of-an-oven

https://cooking.stackexchange.com/questions/63280/how-do-i-remove-aluminum-foil-from-the-bottom-of-my-oven

https://www.bing.com/videos/search?q=Help+with+removing+tin+foil+from+bottom+of+oven%3f&qpvt=Help+with+removing+tin+foil+from+bottom+of+oven%3f&FORM=VDRE

https://www.hometalk.com/35931852/q-see-below

This might help

http://www.howtocleanstuff.net/how-to-remove-melted-aluminum-foil-from-the-oven/

We put in a new oven and it has warnings all over about not using aluminum foil in the bottom. Once you get it off, you can buy a drip pan that is inexpensive and basically disposable.

Good luck!