Worst delivery process and company behaviour

Greetings, There is nothing wrong with the Toyota Innova Crysta but Om Toyota Kota's sales head and his team members are not in a position to talk, their behavior is very useless and they are not giving the delivery of the vehicle on time even after depositing the payment and having been complaining for 3 months, despite complaining to the seniors, they are not taking any action, what to do with such a company, the company and the dealer are colluding with each other, which we regret very much. Thank you.