PaySense — paysense stealing and misusing my personal data

I had taken loan from paysense and had paid 3-4 emis. Now due to some reason i am unable to pay and have informed the same to the paysense. But now paysense collection executives are calling and harrasing my family and friends. They are stealing numbers from my phone and calling. They called a lady colleague and telling her you are his wife ask your husband to pay else we will come to your house and do hungama in front of your neughbours and spoil your and your parents name and reputation. She told them she isnt my wife so then they said you are his girlfriend and are harrasing her. They also called my sister and told her i have used her signature to get loan. The executives are very arrogant and also abusive. Paysense is working against rbi rules and law by stealing data from my phone and abusing my contacts. I also called and informed their collection manager but no action from her side also and still the abuse is continuing with no solution and it has becomr a mental harrasement for me as they are spoiling my respect in my family and friends. Please tell me how to resolve this matter at the earliest.