Don’t
Thats likely the issue, if you are “spamming” a block/unblock to remove a follow. It’s getting wedged in the backend due to too many people doing this same thing for no reason
See also: the official advice for dealing with this sort of “attack”:
Hey there! Looks like you found us on a quest for help with view/follow bots. You’re in luck. While we can’t help you directly, you will find your answers here: Twitch Help Portal or here: Twitch Safety Center
There is no need to do this sort of clean up on your own. And just stops people using the block system legitimetely