Small block 727 issues

If they shipped you the wrong transmission, it's on them to absorb the return freight charges. If you can't get the correct answer from whomever you deal with, ask to speak with the highest ranking person there. If he/she can't make it right, tell them you will take to social media & spread the word as to how they screwed up. BUT, if you "ordered" the wrong transmission, it's going to be on you to foot the return. Just make sure everything is correct on your end before raising HELL with them.