Ridiculously overpriced

I'm on Momentum's Multiply and currently paying R870p/month for my membership, which is their Premier membership that includes nationwide access. Seeing that it doesn't make sense as I only go to one gym in Johannesburg, I wanted to downgrade my membership to only one gym. While doing so the lady informed me that it'll be R712p/month to have access to one gym!! I find it ridiculously expensive!! How is it possible to charge people R712p/month (including Multiply discount) to access only one of your clubs??