O Tech — o tech harassment

Sir
I am swathy and i got a call one day for the captcha filling work from o tech company. They said that the company will pay you 22500 if the work done in 10days. The detail in whatsapp i started the work. But not completed. Next few days later they send mail to me. Nishi sharma advocate i pay the 21000 with in one day. Otherwise they send legal notice in my house via policestation. I got complained police station. Please help me to solve this