Telenor has introduced call blocking service that stops the specified number from calling you. Once a blocked number calls you they will get a busy tone or ringing tone based on the settings you select. This service can be activated by sending a SMS ‘sub’ to 420 to get registered. Once you are registered, you can message the number you want to block to 420. This call blocker service costs Rs. 20 + tax per month whereas blocking or unblocking a number through sms costs Rs. 2 + tax (one time). 
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It will surely take care of unwanted callers. Wish u best of luck paknpak in ur new venture.
Thanks dude !!
*two thumbs up*
I found it very helping !!
Keep the good work up !!
good work boys!!
thats interesting!