Spectrum — harassment

Day i was searching for a home based job and i saw a job in quilt i applied it.
After applied a ladies representative called me sir do you looking for a job.
I answered him yes but i am under 18. Then he told me send me your brothers sister's or any guardians document. Then i send my sister's document.
After applied they send me a agreement paper without my sign and without my sister's acknowledgement.
In agreement i read that if you not complete our work then you should have to pay 3700 penalty.
After i read i called ladies representative and she not answered my phone.
Another day i got username and password on my email id. Then i shocked
Then i call in hotline number and i say mam i don't want to do this job because you don't say the terms and conditions before i applied. Then she says you should have to do this job now.
Then i mailed in their mail id.
I don't want to do this job because your representative gave me the wrong information.
After 1 hour a person emailed me from gf. [protected]@gmail.com
And after that they are continuously threatening me.
And after i ignored that they send me a mail from surat. [protected]@gmail.com
Please suggest me what i have to do next can i pay them or not because they are doing fraud with me.