today I got a call on my calling number that after hours my calling number will b block.

today at 12:22am and 12:49am I got a 2 call on my calling number by a unknown number and they said me that my calling number will be blocked in 2 hours, I don't know how and they were saying that i've registered for the same ( to block my number ) but I didn't. i've tried to register a complaint on jio help line number but I don't got a satisfied response from there too. so want to know the legal procedure how to resolve this situation and how can I block this type of calls on my number.