But yeah man it seems like your transmission pumped broke. Idk if you need a rebuild for that. I think you just need to get a new pump but I don't know if anything else got damaged but it could be the shop trying to steal your money. Go to aanother shop and tell them you think your transmission pump is broken how much will it be to fix it and see what they tell you, it will make you seem like you already know about cars so they will try less to scam you.