fini technology - Trying to extort money

On *th March ****, I paid and joined the so-called company fini technology. It is a company which says to provide part-time work from home jobs. I paid Rs *** for it at that time. They said to type *** pages in ** days in notepad and then after completion of the work on **rd March ****. I sent them the work then on ** March. They said that I had many errors and I have failed to provide **% accuracy so I won't be paid. On ** March they mailed me about the termination of my id and said they will not provide any new work. On ** March they called me and mailed me by a so-called lawyer Mihir Patel who is talking very rudely and is giving me threats like if you will not pay the remaining amount of **** otherwise we will file a case against you. Being threaten I paid them the **** rupees when Mihir Patel said to me that no case will be registered now against you and its all in the mail conversation between us and the call recordings. After getting the payment of **** they asked me to pay Rs **** as cancellation of the bond which was signed and does not mention about any cancellation fee of the bond. They told me on ** March to pay the money instantly or they will file the case against me. And also they gave me threatening calls that if you don't pay the remaining **** which is nowhere mentioned in the agreement and neither was I told or pay us Rs ****** as the ** months salary of yours as the bond was of ** months. They are torturing me. Please help.