Their test is rubbish. As is their assertion that it needs to be manually wound. Nobody manually winds an automatic watch as a matter of routine, let alone every morning and evening.
You have 2 choices: Insist on your 14 day refund (assuming it's ok cosmetically they can hardly say it's not pristine if they're saying it has no fault) or allow them a chance to rectify the situation. To be honest I'd insist that it is sent to the manufacturer for a full test but if you cannot wait for that procedure then a refund is your only option.