Relief India Trust — fraud and unlimited calls with emotional threatening

Hi All, I got a call from [protected] on 14th august. They called me and stated as below "Gd morning mam, i m from relief india trust.It is a NGO which is helping poor childrenin all india.We need your help today on urgent basis.We reacd.A extreame urgent case about 2year old girl who is sufferin from blood cancer by birth and fighting with life and death in AIIMS hospital.Today hospital given her bone merrow transplant date and we have to deposite 2lacs rupee.Otherwise this girl will not survive .Plz check detail on our site and do help.And sms after help.Thanks.." I was in a team outing so i said okies drop me a mail i ll check if possible. They keep calling me on same day k please access somehow n transfer amount. I didnt reply and when i reached home ..i discussed with my circle, they said dont donate... Now again after 8 days a guy called me from A.Pm +91- [protected], started shouting " madam aapne phone kyu nahi uthaya aapne humara time kharab kiya...he was kinda rude in language... He gave full emotional drama k aapke ghar ka baccha nahi hai na!!! And aaj uska operation hai..hum college students hai blah blah...then immediatly i checked in internet and found its a big fraud... Its really bad ...i can stop myself by not reaponding the calls from some other country but how can i avoid these people..whu there is no action for this till now