Bajaj Finance — call from delhi investigation officer to pay loan amount which was fully paid 2 years back

Address:

Mumbai City, Maharashtra, 400706

Hi, i got a call from delhi officer saying pay the amount or else we will file a case against you.gave a number of so called advocate and he also threatened us and forced to pay the money.i asked bajaj finance for clarification after money transfer and they are saying blah blah amount.and said warranty amount is not paid.bt if warranty amount was not creadited then how did they change my tvs part withount amount?premium is 1088 n i paid 26000.i m going to file case against bajaj finance ppl for harrassing me