That's why I do my own work. You never know what they strpped/forgot to tighten/hooked up wrong ect.
Doesn't guarantee that you don't screw something up, at least then you have no one to blame but yourself. Years ago, did a clutch on my FZ6 with an oil change. Buttoned everything up and went for a road test. 30ish km's later was on the side of the road with most of the oil leaked out and no drain bolt. Thankfully, nothing blew up.
Everyone makes mistakes.
I did have oil changed by local yamaha shop. Checked level but not the cap. I'll do my own from now on and check the cap also.
Get in contact with the shop and let them know what happened. I would ask them to clean up the mess, replace the rear pads and tire. Most respectable shops will take care of it with barely a discussion.
If you want to do it yourself, there's no better oil remover than brake cleaner. Super harsh chemical so you have to be careful, especially around plastics and rubber. I will generally spray it on a rag and wipe down the offending area. Strips the oil right off, leaves no residue.
Also, depending on how much oil leaked onto the rear pads and rear tires, you may want to consider replacing them. If they got soaked, there's no getting it out as it will seep in. Last thing you want is oil on your rear tire on a rainy day.