Air India — Refund query of my tickets

I book four ticket airindia flight no AI-888 pnr no is JYVC6 blr to delhi 31/05/2022 booking date is 17/05/2022 and cancel date is also same by air india agent with full refund but refund come after cancellation charges apply. Many times I complaint against air india. But not resolve . 1) khamosh ticket no[protected] sunil kumar[protected] sandeep Sangwan[protected] hansika sangwan[protected] . I fill the feedback form also . What i can do now .