Since you've tried unpairing, rebooting, and charging, and your Mac is up-to-date, it might be a hardware issue. Have you checked the System Preferences to make sure the haptic feedback settings haven't been accidentally altered? Sometimes updates can reset settings, and it's worth a look.
If you're considering an alternative while you sort this out, you might want to look into this
touchpad. It's a large, wired device that supports multi-gestures, similar to the Magic Trackpad. It might not have the same level of integration with macOS as Apple's trackpad, but it's a reliable and affordable option. I think it's something you might like.