Regarding Fraud By A Training Institute In Chennai

I paid 72k to an online technical training institute in Chennai after seeing good commitments on their website in mid-december 2020. Since then they have changed 3 trainers and the level of training is completely pathetic. When I am dissatisfied with the trainer, they simply allocate another trainer who is equally worse. I have not learned anything at all. I have mailed them about my grievances but I don't get any response from them. I have asked them refund but they are refusing. I am on a tight timeline to complete the training because I have to join a job soon but the institute is just wasting time and I am totally depressed. 72K is huge money and I do not have more money to learn from other institute. They are pushing me on the verge of suicide. They have not complied to any commitment that they have made on the website. Please tell me the way forward.