Unhappy with Service

I had a contract with Netstar , my vehicle got accident on the 16 Dec 2024, I did notify them that I got accident didn't know that I was supposed to call cancellation department , however now am getting threatening calls that they are taking legal action , last when I spoke to their consultant i asked them to share with me installation certificate as they mentioned that I was in a contract within 36month and i need to pay though i dint have a car with me anymore , I even regret as a bought a new car and is under Netstar as this is agreement with the dealership , I sent an email to Netstar-financelegal on the 20/08/2025 with no response till today but I got automated response to show that the e-mail went through .