O Tech — threaten me

Address:

462003

I registered on the o tech for captcha work. The provide me a app by the name of mac2cap. The app was not working properly that's why i can't complete my work. After 10 days the call me and said that you have to pay a penalty of 5000 rupees otherwise we will put a f. I. R on your name in mumbai court.
So please help me in this. How can i pay fine for such thing whose app id not working properly.
Please help me in this and tell me this is scam or not