Frontech — harassing regarding depositing money

Address:

324, Galaxy Emperia, Warud road, Aurangabad, maharashra 431005, Aurangabad, Aurangabad District, Maharashtra, India

I completed a job of 1500 forms for Frontech. Now in my QC report most of the forms are correct but they are shown in incorrect forms list. Today their lawyer mailed me demanding me to deposit 15550 by 11AM of 19 June 2019 otherwise they will take legal action against me as they have a contract on legal document with me. They got it done on pretext of my sign and passport size photo without my consent that they will be using in that way.
What should I do now? Should I pay them or not?
Please help me.

Frontech Represntative - Ruchi[protected]
Frontech Lawyer - Punit Gupta([protected])
Helpline email I'd - [protected]@gmail.com