Flashcash — getting harassing call

Address:

Mumbai City, Maharashtra, 400064

Iam getting calls from flashcash collection agents stating that i took a loan of 8000rs last year i. E sept 2018 which iam not aware about. Now they telling me to repay it. From past 1year they were sleeping and now all sudden they calling me my friends and family members and harassing. I dont even know how come they getting all contact numbers. And firstly it is illegal to harass them. The person who call me dont have manner to speak n they told me they will submit legal notice. Iam ready to face the consequences so if its my mistake so i told them to go further and submit it. But they still keep on calling n harassing me and my family members.