Help needed: company delivered wrong item, they do not want to annul invoice

So I wanted to get some advice with troubles I'm having on the delivery of some printed items.

I ordered time-sensitive prints that needed to arrive today at the latest. The items I ordered were 12 books; 6 of them printed based on pdf-file A and another 6 printed based on pdf-file B. I had proofs of them and all proofs looked good. The final prints arrived on Wednesday, but as the order was lost at our firm due to a misplacement, I was only able to check on them today. The prints are not what I ordered: not only are all the books printed in slightly different colours compared to their physical proofs I received beforehand, I also got 12 books of pdf A. There are zero books to be found based on pdf B.

I notified them of these errors. To the differing colours they answered that they cannot control this, as 'printer colours differ from day to day as this is a feature of digital printing' (is it?? I literally never had this issue with any other company I ever printed something at). As for the 6 missing misprinted books, I asked the company to remove them from the invoice as I really needed them by today so there is no need for me to receive them anymore. They however refuse to do this. They insist they DID deliver them; I even send them a video of me going through the delivery and opening every book one by one to show that they are all the same. They have now responded back they are not answering any mails of me anymore and that I have to pay the invoice in full. This would mean paying about €200 for a set of books I have never received.

So, what are my options here? They do not answer my calls nor respond to my e-mails anymore, and the books they delivered are really not what I ordered. I am not going to pay for something I did not receive. I still have the original orders that I send them, along with other communications that prove that I asked for 2 different books to be printed and not just one.

EDIT: clarification