Ola Cabs / Ani Technologies — Ola spamming me with 8-10 calls per day

I was a ola operator (Operator Code : PATNAX[protected]
Later i sold the car. After few years ola started spamming me on daily basis 2-3 calls to return Rs 1500 shown due on my account. Another 5-6 calls would come saying me to start operating my car inspite of telling them that i don't have car anymore. For Rs 1500 due, I told them that they have Rs 3000 of mine as security deposit so actually they owe mine Rs 1500. They start using foul language & say i need to return Rs 1500 to get 3000 refund. Pathetic. I am spending Rs 500 just to block all ola calls on my phone.