Advice - Stealership F-up

[Eh-Fore]

Typically I do my own oil changes, but I had to get a new tensioner and belt put on so I figure why not let them do it quick.

After I got the car back, I was driving up a steep incline, and heard knocking. (No knocking on regular flat ground.) I checked the oil, and it looks about 2 quarts too much. WTF, shouldn't these places know what they are doing? Question is, with 250miles driven on this, should I demand them to check/replace the oil pump and o-rings? (What are the chances I really F'd these up?) Should I trust these bozos to do that? Would I have the right to demand that they check/replace it?

Thanks.

[4Rings3Liters]

Yes, have them check the car for damage caused by them.