MaRsO0o wroteEasy to say that hussam, but what if your sister or mother were the blackmailed ones , and recieved sms full of swearing all day long , would u still "simply" ignore it ?
I suppose not. Looks it is getting overly annoying.
One last question..Is it harrassement or is there actual blackmail as in "if you don't do XZY, I will hurt you". Either way, do as Kassem said and report it.