From my past experiences with paintless dent removal, there is not a 100% gaurantee they will remove them, and they are not responsible for possibly damaging the paint if they could not remove the dent. However, the operator should have been experienced enough to know whether or not he could in fact remove the dents before he started. At most MB dealerships (unless you get a very large and good one) the detailers are literally just kids (like 17 or 18) that hey hire as temps to do the cleaning work. That's why I would never let my car be cleaned by my local dealer. As for the swirl marks, just complain and see what you can get done. If they have any customer satisfaction at all, then they should either remove them themselves or pay a pro to do it.