Probably my town has big bug.
I contacted customer support many times, but they paid only 50 Tcash and ignore this problem.

After latest update, many unknown players come to my help, many unknown clovers come to my house of luck.
I noticed that all of these unknown players are one of my facebook friend's frieds(not mine) and I removed the friend from my facebook.
But these players still come to my town many times. Many unknown clovers still come to my house of luck although I never helped them.

I want to know how to remove these unknown players.
I think system bug wrongly select me as these unknown player's helper and they come to my town from recent helpers tub.