STM — fake calls

Please Help me Because I was getting a number of calls from STM company and they Said to register for filling the 1500 forms later they gave 10 days time and now they was saying I did a mistake and I have to pay penalty for that and they told to pay 12, 500 and I paid that and after 2 hours they called me and said to pay 17, 540 rupees to cancel the agreement and I paid that and after one day they was saying to pay 35, 000 for the clearance charges of the court so I was rejecting the calls of them and now they sent msg that the sectional charges has been taken on me So please help me