I agree with Daryl and would like to add another point. Have you checked the grade stamp on this lumber? It has a lot to do with the quality you can expect. The stamp should tell you the Mill it originated from, how it was dried, a grade designation (#1 or Select being the best, with the words Kiln
Dried; #2 has some knots in it but they are solid; #3 or Utility is the cheapest, it is usually S-dried and has knots and knot holes as long as they are not over 1/3 of the width of the board). Spliting is almost always a result of poor drying.
I have never seen a lumber yard that would take back wood that has been cut but they might take back what is not cut; I'm sure they will want to sell you a higher grade next time.