Shiksha.com — Getting unwanted calls and messages from shiksha & other colleges.

Hi, I made an inquiry on at shiksha.com for M.tech industrial enginnering correspondence over a 4 days ago where they asked for my mobile number as they would send me the details I was seeking by sms. Now they have spread my mobile number and mail id through out India saying I want to do a M.tech course which is incorrect. There is no option for me to deactivate the account now.
Account I want to be deleted is siva.thamarana.[protected]@siemensgamesa.com and my mobile number also. kindly do the needful earlist.