I use double lines I have been using my 1st line for several years. I bought Turkcell line on my father since my internet was not enough about 5 months ago. I only gave my number to my girlfriend, I did not subscribe to any site other than that, I did not give it to anyone. My number is always dialed by numbers starting with '0850'. I open it is either advertising or closing without sound. If I block him, they call from another number after 5 minutes. I'm sick of it now. Isn't there a cure for this?