British Airways — customer care. trying to cancel a ticket for 7 days. they are not contactable by any mode

Don't book with british airways i booked a ticket through british airways for my upcoming trip on 18th march'2020. Now, due to corona virus outbreak, government direction and company direction i have to cancel it. I am trying to contact them by all modes. Through website if you try to cancel it is directing to a number. Whenever calling the number it's getting automatocally dropped after sometime. I tried at least 50 times. If i contact through twitter/ facebook they are saying someone will call. That call never came. If i email a auto generated response is coming saying they will contact. But noone contacted yet. They are just not co operating with customer to cancel/ reschedule