What legal steps can I take if HR refuses reimbursement?

In the first week of February 2025, after two rounds of interviews, an MNC’s HR called me to Pune for 'joining'. They never sent an official offer letter, so I had doubts. I asked for interview travel reimbursement by email, and HR agreed. I went, but was later told I was not selected. I submitted all my bills, and for two months, HR said the reimbursement (₹22,000) was in process. I even received an apology email saying the payment would come by March-end. Now, the HR is not responding to my calls, SMS, or emails. I have been unemployed for six months and have health issues. I'm from Madhya Pradesh, and the company office is in Pune. What can I do legally?