Keeps demanding more payments

In October 2021 I went to their East Rand Mall store to settle my account. On their records my account has a zero balance which has been confirmed by several emails from the customer service consultants. A month later they still demanding more money than what was my initial balance. They are just a bunch of blood suckers demanding more money than what is due to them. The store searched their system and gave me a settlement value which was paid on the spot. Pay your own service providers for the service you have requested and I paid what I was owing.