We had a similar situation to those mentioned above. We are a large company, we were approached by zillion about an article, there was an unclear email about column millimeters that they later claimed were costs, we signed an order sheet, but the order sheet did not indicate costs any costs but did reference that there would only be shipping costs if we ordered more than 25 print copies. we elected the digital copy, and were then sent an invoice for 6,700 EUR! we disputed, as there was never any signed transaction document indicating costs, after some back and forth they offered a 5% discount, we declined, they threatened to send to collection agency. This is a SCAM. DO NOT BE TAKEN IN.