You were right in the sense that everything you say makes sense--you should get a receipt. However, they are not obligated to provide one--the law does not require them to  provide a receipt in this case or circumstance.There is no one-size-fits all receipt form, but also no requirements as to what it must have. While you can't compel them to sign a form if they don't want to, you can certainly draft up a simply form saying "[Dealership] acknowledges receiving [your name's] car for service at [location] on [date]"; adding any other terms you discussed with them or feel important; and seeing if they'll sign it.Ultimately, if you don't like how they do business or worry about this, you might want to explore other service options.