Access denied due to limited options

I returned to South Africa after 2 years abroad and tried to login ANYWHERE on my Discovery Health account and it turned into my worst nightmare. Despite saying that they are available on Saturday mornings their phones said closed. Obviously my phone number is no longer active to receive otp codes but there is absolutely no alternative which to access this code. Information I urgently needed for medical reasons. So disgusting that these big companies gets away with such sick behaviour.