How to block a lost cell phone/SIM?

I just lost my LG KG370 :( along with the Telenor SIM I was using with it. Can either of those be blocked, and how?

I'd bought my SIM from a third-party reseller but I had associated my NIC number with it. The phone supposedly has some LMT feature that I'd set up to send an SMS to another number, in case of a different SIM being used with it.

Do I need to visit an official Telenor service center with my ID card?

Does this work; calling the CPLC (Citizen Police Liaison Committee) or e-mailing the PTA?