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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.
 
But it doesnt block whatsapp messages, right? There is no way to make a whitelist of allowed contacts to reach me via whatsapp, right?
 
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