AITA for refusing a $47,600 rehab contract that was signed for my brother without my consent?

I woke up from a routine procedure to find a $47,600 rehab contract signed in my name while I was still groggy. My mother called it "ride-home paperwork." 2 weeks later, a billing investigator asked, "Do you know whose treatment your signature guaranteed?" I did. It was my brother's. ---------------🦦Otter Stories🦦--------------- #reddit #stories #redditstories