Flex Enterprises — they are threatening to pay me the amount of 12500 for agreement closing

Address:

Flex Enterprises, Kultan Wadi road , Aurangabad, Aurangabad, Maharashtra

As per the agreement i paid the 4500 amount that mentioned and i got the noc from the company and now they are telling me to pay the amount of 12500 to close the agreement. And they are saying to pay it for closing the 11 month agreement bond now... Pls help me... I don't know what to do... Some of the advocate from different phone number they are calling and saying me to pay the amount. So please help ma