BLACKLISTED due to Poor accounts Management

I cancelled my Gym Company contract in 2017 and was told that my cancellation forms were submitted by the accounts manager. This was after them charging me an extra month after I actually submitted my cancellation. I had to enquire why I was getting money deducted from my account.

5 years later I get an email from an apparent representative of Gym Company, Tracy Maluleke, that I am blacklisted and that I should pay R1000 to cancel my account or continue paying R700 to continue my membership. Instead of addressing the error on their side after I provided proof that I had submitted cancellation I am told that I need to make time and use my resources to go to their offices to sort out the error.

I am currently on military training and confined to base. Yet they expect me to sort out their poor management and unprofessional treatment of the issue.