HP India — Laptop battery not delivered

Hp agent had come to fix my laptop keyboard. After that problem was resolved, I asked him how to fix my laptops battery. He said he would bring a replacement and asked me to pay 3000 rupees for the battery. I trusted him as an hp agent and unfortunately forgot to take a receipt for the payment. Its been over 3 months and he has not given me the battery yet. Whenever I call him, he keeps telling that he will bring it the next day and keeps delaying.