Cannot contact Discovery by email

Discovery will only let you communicate with them by phone. Can't even send them an email to get authorisation. And I'm sure they want to isolate themselves from their patient / client / customer base, so that no written record exists in case they are legally challenged. So I (as a pensioner) have to spend at least 20 minutes of my pre-paid airtime to talk to them, including having to go through 2 or more time-consuming verbal security checks. Well, at least I now know that I will never use their banking or any other services of theirs.