There is a small bearing in the middle of the zodiac. I guess your situation is the same as mine. Poor sealing and water leakage caused the small bearing inside to rust and get stuck. I didn't buy it at the jewelry store you mentioned, and I didn't pay attention to whether it provided free maintenance service. Although I live in Hong Kong, I took the trouble to have it repaired. I slowly pry open the lid and drip antirust oil. After cleaning up the oil stain and accumulated oil, I seal it with glue.

Since your situation provides free maintenance service, you'd better send it to Hong Kong in person, because the small bearing inside is rusted when it is sent for repair, and they may ask for a replacement fee. If you send it by express, it will be a problem to pay the maintenance fee. This is one, and the other is who will bear the responsibility for the loss in the express delivery process. Shopkeepers may be afraid of trouble and refuse to hurry. Of course, this is just my guess. Don't you have a phone number on your bill? Call the store first to discuss it.