Inflated Premium

I am subscribed to Discovery Health Keycare, which costs "from R1,102 a month". However, Discovery is billing me R1,607 a month, or 46% higher. In the past, they have inflated my subscriptions -- then reduced them on complaint.

I wrote to Discovery Health about the above. While I have received a letter since, it has an invalid password (my birth date), and cannot be read.

I would like to start and finish this on Hello Peter. In the past, Discovery has inflated my subscription. When I put the matter on Hello Peter, they said can we continue this discussion in private? Then they told me where to get off.