Blocked account

I’m very disappointed with the service from Zone Fitness. They debit R407 from my bank account every month without fail, but every time I go to the gym, my account is blocked because their system claims I owe R1. This has been happening for months. Each time, I have to phone the accounts lady to manually reopen my account, even though the problem is clearly on their side. It is incredibly inconvenient and unprofessional to block a paying member over an internal billing error. Zone Fitness needs to fix their system and stop inconveniencing customers.