Supersonic/VVM Debt collectors

I'm feeling frustrated and fed up with the lack of performance in our country. When I initially signed up for Fibre with Nepic, the service was satisfactory, but over time, it deteriorated. Despite numerous emails and calls to cancel my subscription, I was still debited for three months after receiving confirmation of cancellation. Then, Nepic transitioned to Supersonic, and I continued to pursue a refund for the money owed to me, which never materialized. Fast forward to 2024, I'm contacted by VVM Debt collectors claiming I owe Supersonic over R6000, which is strange considering Supersonic still owes me money that was never refunded. I've asked VVM to verify that I never received service, wasn't invoiced, and wasn't contacted after requesting a refund from Supersonic. It's appalling that despite supposedly recorded phone calls confirming cancellation, VVM continues to harass me, ignoring my emails.