I was doing a job of online form fill up they have provided me 1200 pa

I was doing a job of online form fill up they have provided me 1200 pages to complete it within 12 days.... i have sarted doing the job but then i came to see that most people have spamed the number so i thought may be they are fraud ...they have said me to upload my signature and they have copied it to an agreement ...they have send me that agreement but they didnt said me that they have copied my sign there....ow they are telling that i have to pay 7600 rs or else they will file a case on me