Airbnb — refund calculated in very wrong way.

Address:

Mumbai City, Maharashtra, 400016

I had booked a airbnb in france on 31-may to 01-june 2019. But due to change in plan i cancelled the booking.
My cancellation policy was moderate.

Cancel within 48 hours of booking and at least 5 days before check-in
And the entire reservation is refundable. After that, cancel up to 5 days before check-in and the nights are refundable, but the service
Fee isn’t. Cancel within 5 days of check-in and the service fee, first night, and half of the following nights are non-refundable.

While cancellation it showed be proper values. But after confirmation on mail, they added tax of 4000/-inr and refunded only 1200/-inr.

I have both the receipt with tax value changing from 800/- to 4700/-. This is unethical and fraud.

And also to complaint on their website it is very difficult to find contact process.

I raised the complaint on 9th may by both call and message. Still no reply and automatically complaint got closed with my concern