Uc Solutions — unethical behavior and harassment to make payment to unauthorized person

There is a company by the name UC solutions that's providing online form filling jobs where a candidate is given 10 days to complete filling 1, 000 forms for an amount of 20/- per form. After getting in contact with Amit Kumar I was then contacted by another person to finalize the agreement. After the agreement was made I then started with the work. There were a couple of questions that I wanted to clarify but when I tried contacting the helpline number but it kept coming as unreachable or busy. When I tried searching for the company there was no information available on the internet. But while speaking to the concerned person initially she said that the company has been conducting busy for the past 5 years. For a company to be conducting business for 5 years and having no Information about it was really fishy. The first thing than came to my mind was that it's a fraud company but I still continued the work in good faith as the contact had a clause stating that if I had to fail in completing the work within 10 days or failed to get a minimum of 90% accuracy in work then I would have to pay the company 5, 200.
Hence I completed the concerned work and submitted it to them. After submitting it to the concerned personal I then received a message saying that I have failed to achieve 90% accuracy in my work and they were demanding 5, 200. When I checked my report to see what was wrong with it showed all 1000 forms rejected as there was no spacing between ( - ) When the demo work was given to me there was no space between the ( - )and hence I completed the work with regards to the demo work shown to me. The fault is of the company and yet their demanding for the penalty payment of 5, 200.
Yet I called up [protected] to find out how to make the payment as I didn't want any problem but the lady that picked up the call spoke very rudely and kept demanding for the money after which I refused to make the payment.
I then received an email from Advocate K.R.Mane demanding for 5, 200 plus an additional amount of 3, 000 or else a case would be registered against me.
Firstly there is no information about the company called UC Solutions over the internet.
Secondly all the email ID's are not from the company.
Thirdly the helpline number was unless during the work time but when it came to asking for the default money I kept getting calls demanding for the money.
Please do look into the matter and help me find a solution to this.