Air India — Refund not received after ticket cancellation

I cancelled a return ticket from Air India on April 17th for a flight from Toronto to Pune India. The team told me I will be charged $400 as cancellation penalty and will receive my refund in 21 days. After 21 days I followed up but no response and they kept telling me it will be processed soon. On June 2nd I received only $69 as a refund. So when I called they say it shows refund full processed and didn’t know anything beyond that! I keep calling the team every 2 days and they either give me and email id to report this where I never get a response or they tell me they can’t do anything. This is very unprofessional and I have never regretted my decision to choose Air India. The entire thing has just given me extreme stress and frustration. I’m tired of chasing them and seeking help everywhere to resolve this! Please help!! My details: E-ticket numbers[protected],[protected],[protected]Infant) PNR Number: AI JFR93