I'd like to get your feedback on a dispute with a machine shop if you don't mind...

I recently bought a 1 pc. RMS block from a machine shop across the country. I spelled out that I needed a one-piece rms block, bored .040 over, and clearanced for 400 crank. Cams we never discussed. What I got was a non-roller block (no bosses at all) with a one-piece RMS. The shop is willing to take it back, but we're at odds over about $200 in shipping charges. We both agree that no one discussed needing a roller cam, or that the block might not support a roller cam.

Shop's take:
I didn't tell them that I needed a roller cam setup, so it is my fault, and I should pay for return shipping. I managed to tell them the other specs. Why didn't I tell them about the cam requirements?

My take:
The reason I bought the block was to upgrade to an OEM roller cam setup, since I needed a new block anyway. The fact that these blocks even exist was a surprise to me, so it didn't occur to me to tell them I needed a roller setup.
The shop should have asked me if I needed a roller cam setup if they are selling such blocks. They didn't ask, so they need to refund me for both the block and freight, so I'm out of pocket $0.

Your take?
What do you think? Is it the shop's responsibility to ask all the questions, or the customer's responsibility to be specific enough to get the right block.

Thanks for your input!