Start here
Locked after a confirmed pay, or you closed Hub? Do these three checks before you write anyone.
Support
If a pay looks stuck, check the chain first. Then report from the listing.
Check the chain
Open the listing and choose Check the chain again.
Confirm the hash
Look up the receipt hash on nimiq.watch.
Confirm the address
The seller on the listing must be the NQ address you paid.
Then write
A bad listing: use Send report on that listing page. Do not send NIM to anyone who DMs you as support.