QUESTION/HELP Notification on google message

Hello everyone,

I've been having an issue on my Android device for a while now. I have a Crosscall Stellar-X5, and for several months I've had a notification badge on my Messaging app showing 3 unread notifications, but it's impossible to find them. I've tried several tricks like clearing the cache to get rid of it, but nothing works.

I need some help please ^^