T24 Mobile — sim card need to be blocked

Please block my t24 sim. It belongs to orissa circle. I lost my phone.. It was stolen. So i want it to be blocked as early as possible. Will be obliged if the authority kindly block the sim as early as possible. Inhad been trying to call the customer care but it remains unanswered. I am currently in delhi and want it to be blocked. Please look into the matter.