If it were me i would get back to him or her ASAP!! And tell them that your not happy with, the fact that it was graded as M- when its obviously no where near it. And what ever it was you paid for it, try and get as much back from him or her as poss!! Ok maybe they could argue the toss and say that it plays perfectly well, but that would,nt be the point would it! They should not grade (i presume an expensive record) that way, and expect you to pay top wack for it!
JB xxxKTFxxx