Drivezy - Demand for money from drivezy

I booked a car from Drivezy in **/nov/**** to attend wedding and while returning my vehicle is stopped suddenly and won't start again. I called local mechanic and consulted on phone call as I was in middle of village. My local mechanic said to tow the vehicle as there were no garage nearby and it was **:**pm of night all garage on highway were closed so i towed the vehicle to drop point of drivezy in Kothrud,Pune. I called for towing car and for ****/- i towed my vehicle to drop location. After dropping the vehicle folk from Drivezy checked the car completely and tried to jump start the vehicle using other cars battery but couldn't start still that folk said nothing and ended the trip and I paid the remaining due amount. After * days drivezy called and I was asked to pay **,***/- for damage charges.During the trip i had no accident or any damages that was caused by me. After *-* days I got call from drivezy again asking for money and when I asked about the damage they said that oil is leaked from chamber and engine is seized and we opend the engine the total quotation for repair is nearly **,***/-. They also said to bring your own mechanic to check the vehicle.When I asked them about why are they calling after * days and what happened in those * days on this they said bluntly that their mechanic was not available. Today again I got call from them asking for **,***/- as per their mechanic gave repair quotation to them. As I'm a student they are harrassing me for money.