Rage is ****, and always looking for ******** ways to blacklist customers

I asked Rage to close my account, while it had a balance of -R294, they did not close it, now they telling me that I must pay them R74, two months of asking them to close the account for me, I called and even sent Emails for them to close my account, they promised that it will be closed at the end of Business day in August, now its almost end of September they telling me about R74, I have proof that I was paying rage upfront, In actual fact, they are the one owing me.