DO YOU NOT KNOW HOW TO PICK THE RIGHT SIZE?

THIS IS THE SECOND TIME THAT I HAVE ORDERED THE EXACT SAME SHOE (size 9) ONLINE AND THE WRONG SIZE (size 10) WAS DELIVERED TO ME! I WENT TO SPORTSCENE SHOP NEAR ME TO GET A REFUND OF WHICH I DID AND DID THE WHOLE PROCESS OF ORDERING ONLINE AGAIN ONLY TO GET THE WRONG SIZE A-****IN-GAIN!!!! THIS IS TRULY FRUSTRATING AND UNACCEPTABLE! I WENT BACK TO THE SPORTSCENE SHOP NEAR ME TO GET A REFUND AND THEY REFUSED TO REFUND ME AGAIN! SO WHAT NOW HUH?