AA-NTAROT Activated automatically

I got a call at 11am and i have just lifted the call and cutted the call. i got a call to activate 10ps/month.. for 84 days. i am not pressed any number to activate. i have just cut the call . after 2 mins i got a message that i have activated this AA-NTAROT. please deactivate this from my mobilenumber . wat is the process tell me to deactivate this