GoAir — Refund for cancelled ticket

My travel was scheduled for 20th june, 20 via go air from mumbai to chandigarh. Just 2 days prior my ticket is cancelled without giving a valid reason as to why and there were no alternate flights available for the rest of the coming days. Not only was there the risk of getting stranded in a city during covid but i ended up paying more than double the price of the original ticket via another airlines. Go air sent a promotional mail saying if they are unable to accomodate in an alternate flight, they will refund the entire anount. But now they are not replying to mails or tweets. This is highly unfair in uncertain times like these.