Kd Technology Surat Gujarat — threat mails from the company

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Respected Sir
I got a call from KD Technology on July 7 2018 for online work and around 11:40 AM they texted me to complete the registration process. They were calling me again and again at that time .At 4:00 pm the same day i got a mail from [protected]@gmail.com After this i got a Call from Mr. NAVEEN SHARMA ([protected]) telling me that he is marketing executive of the company she told me that i have to fill 2200 forms in 20days so that they pay me ₹55000 But on googling aboyt the company i found they have thousqnd of complaints registered against them with in a hour i texted them back that kindly cancel my registration but there was no response Next day i called at their helpline number but they didn’t respond to that too so at last the mail from which i got those log in details i mailed them to cancel my registration but they also didn’t responded. And after seen that i stop my work.
So is there any problem will occur when i didn't submit the work.
Because i don't want to trap in the legal procedure i was thinking to lodge a complaint in my area police dtation amd also send them a legal notice from cyber crime branch Today after 31 days i got a mail from their advocate Raghav Deewan ( raghav.[protected]@gmail.com) telling me about some acts that i have been imposed of and he is asking for ₹7600/- I went to my nearest police station and they said if further anything happens they will file a complaint against them.