Reliance Jio Infocomm — someone else is using my mobile number and whatsapp account

I had one jio number, [protected], registered on my name, abisha i was not using the number but was active on whatsapp, suddenly my whatsapp asked me to verify my number when i tried to contact company the number was given to someone else they didn't inform me but now company has given my number to some other person and now my whatsapp is being used by that person, truecaller shows my details too i want to block my whasapp id and remove all my details linked to that number and sue jio for for doing this to me, my personal whatsapp id is being used by someone else, this is a breech to my privacy