Non-existant service for cancelling flights

Absolutely atrocious service. My husband and I have been on the phone for 4 hours trying to cancel a flight due to travel bans. We are unable to cancel online, there is not customer support email and we have each spent over R200 in airtime waiting on calls only for the call to drop after 45min and no-one to answer. How are we supposed to cancel our flight and claim the voucher/points BA so clearly claims is entitled to us?