My11Circle — Unwanted sms and unauthorised use of mobile number

Hi
They call and send a promotional message on daily basis on my personal mobile number. I have never visited their website. I don't know how they got my number. They call and send their messages from a different number each time so i can't even block them.

For example message, i received “ Dear 8149XXXXXX,
Rs.5000 Bonus to be credited on My11Circle.
HYD vs PUN
Prize Pool - 6, 70, 00, 000 (6.70 Cr)
Entry Fees - Rs.49
Click - http://gmg.im/jexwPi” please take immediate action