Hi
If your Apple Watch does not respond to touchscreen inputs as expected, then the following steps may help:
Remove any screen protector, case or bumper that you may have fitted to your Apple Watch.
Clean and dry your Apple Watch, being sure to follow Apple's cleaning instructions:
Restart your Apple Watch, including force restarting it if it cannot be restarted via the normal procedure:
If you have not yet done so and if you are able to do so, then update your iPhone and Apple Watch to the latest compatible software versions, starting with your iPhone:
If the issue persists, then I suggest that you contact Apple Support (remote diagnostics and/or mail-in service may be available, if required), make a Genius Bar reservation or visit an Apple Authorised Service Provider for assistance:
I'm afraid that no-one here can assist you directly or log a complaint for you. You are not talking to Apple here - this is a user-based technical support community.