Tell him you’ll pay him 1 rupee for not calling you back ever.
Or call him to meet at a medium crowded zone. Start beating him and break his front teeth and shive a pack of red hot chilli powder and keep slapping him till he feels like his head is on fire and is weeping sprinklers!
And just leave.
The above actions take 5-7 secs if not practised. 3-5 seconds if you did.