Hi
I suggest that you contact the Apple Online Store (or the Apple Retail Store where you collected the Apple Watch) for assistance:
Apple's return policy is detailed here:
Returns & Refunds - Shopping Help - Apple
I'm afraid that no-one here can assist you directly. You are not talking to Apple here - this is a user-based technical support community.
Note also that Apple does not currently sell a Rose Gold model. The only gold colour that is currently available is Gold Aluminium: