Uninor / Telenor — deactivating my mobile number

Sir,
I am having uninor sim card. A problem had occurred with my sim. My sim card doesn't work properly and gives no signals. Also the number of that sim is in existence somewhere somebody is using it as i get verification codes on my gmail id though i'm not using that number anymore.

So, i want my number ([protected]) should be deactivated as soon as possible. Please.
Kindly revert back on [protected]@gmail.com

Thanks and regards,
Akriti