Ear-tipping

My moms bf sent my cat to go get him neutered on Sunday, they told us we would get him back on Tuesday but called just now that we could pick him up(Monday) we picked him up and I see that almost half his ear is cut off. I looked it up and it said it was normal for feral stray cats. He is an indoor cat and I had this feeling that something wasn’t right because it was a friend that was taking the cat to a vet. It didn’t sound right. He has his own vet and from the very beginning I wanted to take him to his vet but my mom’s bf just made an appointment and took him. Am I wrong for feeling angry this whole thing just feels sketchy. I can’t stop crying, I have heard about vets cutting a small piece but almost half of his ear is wrong not to mention his ear is small enough. Idk what to do either because I don’t know where they took him and honestly feel like it’s my fault for not asking enough. I just keep wondering how they treated him because they probably thought he was a street cat even though he has beautiful fur I just don’t believe they had right intentions.