Harmless revenge

There are times when you really want to take revenge from people but not actually harm them financially or anything. But just want to trouble them. Like the Uber Driver who cancelled after 15 mins of wait The broker who is rude and is total pain in the rear end That delivery guy who never called but cancelled delivery saying receiver unresponsive. Etc. You really want to take revenge by just troubling them cz screaming shouting kicking in the shin is not an option. But want to remain anonymous as well.

I remember some 5 6 years ago there was an app where you enter the contact number and it'll send 30 40 bulk OTP msgs by amazon, flipkart names. It'll make the person think their phone is getting hacked.

Anyone have similar suggestions? Just fun and for peace of mind.