WARNING - I have not tried this because I like the app.
But if you really want to get rid of it and you can't remove it using the regular Cydia/Manage/Packages/Modify/Remove method, then:
In iFunBox (free for PC/Mac), connect phone then start program.
In left pane, click on + sign to expand Raw File System, then click + sign to expand Library. Highlight KuaiDial and press Delete key.
Then go to /Library/MobileSubstrate/DynamicLibraries and delete KuaiDial.dylib and KuaiDial.plist.
I would then use iCleaner or iCleaner Pro to get rid of unused dependencies and respring.
YMMV.