"You gave a significant chunk of their profit to Amazon" Are you implying this gives Manning reason for the disdain they showed him? From the rough translation

"You gave a significant chunk of their profit to Amazon" Are you implying this gives Manning reason for the disdain they showed him? From the rough translation it seems disdainful. He/she is a customer regardless of whatever vehicle (Amazon) he/she uses. Personally, they should work with you to remedy this situation through various steps. The first should be try to cancel your amazon order and place it through Manning. If that doesn't work, then ... You have every right to be angry at your bad customer service experience.