The Resolution Centre is at the bottom of this page.
The dispute is Not As Described.
The seller will be required to send you return postage.
If he does not , he must refund you without getting the watch back.
Since English is not your first language, ask more questions if you need more help. You can also post in your first language and someone here will be able to respond in it.
(Or use Google Translate if we can't)