Nonsensical policy

What a joke, I phone to change my membership, to a more expensive one and I get told that I am not allowed to because Discovery does not allow upgrades during the year, please tell me which half brained imbecile was allowed to approve that policy, where you won't allow clients to pay you more money? I'm surprised this company is as successful as it is with policies like this one, so now instead of receiving more money me for the foreseeable future, you will now receive nothing as I am now currently actively looking for a different medical aid, thank you Discovery for ensuring loss of business. I hope more people see this and also remove their memberships.