Ola — Overdue Pending

I am receiving call from Ola saying that postpaid overdue is pending from long time. Its been almost 5 years I used Ola. Last time when I used ola, I made the payment as cash and at the same time postpaid amount also got deducted. I raised the dispute on the same day but no response on that. Now I am getting calls saying its overdue. I told 100s of time to the customer service people about this incident still no change.