Badly managed gym membership downgrade - I want out !

I’ve been a member for many years and have had national membership for the last 3 years plus. I called this month to downgrade and was told the admin fee is R200. What I wasn’t told was that the admin fee is due immediately and I will be blocked from accessing the gym. The crazy part is I’ve already (gladly) paid for the full months membership at a national level and therefore have the right to access the gym. Now am being treated like it’s a new membership and that the current agreement for Feb I have is void. If that’s the case you wonder why they don’t talk about refunding me the more expensive national membership payment which now I will not be using. The gym wants me to use some reference number to enter the gym daily - a real inconvenience for a customer , instead of simply reversing it putting a hold and granting me access by overriding the system. I’m at my wits end. This gym cares nothing about customer experience