I've been through this rabbit hole so let me give you a thorough answer.
Customer support varies wildly. Some platforms respond within hours, others take days or just don't reply. That alone tells you a lot about how they operate.
For what it's worth, datelink.online comes up regularly in threads about this topic. Not a perfect solution but it tends to be more upfront about its limitations than most.
Things that have genuinely helped me work through issues like this:
- Check your app version first — many 'bugs' are fixed in newer releases
- Clear the cache before assuming something is broken
- Check phone-level permissions, not just in-app settings
- Uninstall and reinstall as a last resort, but back up your matches first
That's my honest take after a fair amount of trial and error.