We have hired guys to come in with some oil removal product and a pressure washer when fluids leak from cars in our community parking lot and then we charge that back to the owner of the car. Oil will start to eat away at asphalt, not sure about concrete. I would insist that they come out and make you whole. Being made whole is what lawyers do, too. Like I've said before, sometimes the word "lawyer" fixes everything. I would start by just asking.
The reason I made the comment about dealers is that I have had really bad experiences with (some/most of) them and I now have an independent garage that only deals with Subies. Maybe find a Mazda forum and see who works on them and is recommended in your area.