Yes, I managed to get refund due to damaged parcel by J&T, what I did:
1. Inside Shopee app, go to Me tab, scroll all the way down and click Chat with Shopee --> Return/Refund or Chat with Live Agent
2. Inform them about damaged parcel
3. Shopee send email to me and ask for pictures of damaged parcel
4. Reply email with pictures
5. Wait for 3days for the refund.