Discovery Health - Not deducting charges as promised from debit order

I am following up from my previous review: https://www.hellopeter.com/discovery-health/reviews/charging-for-vitality-health-months-after-requesting-to-cancel-***

Discovery contacted me and I was told that one month of vitally heath charge could either be paid back to me or reduced from my next debit order.

I chose for it to be reduced from my next debit order. I received my debit order and the reduction to my debit order was not made.