Delay tactics to keep billing customers - Supersonic does not honor cancellation requests (even though they send automatic responses)

I cancelled my service due to relocation on the 16th of December, spoke to several consultants since then to be told they could not find my cancellation (even though I received an automated response from them with their branding immediately after sending the emails), was promised by a contact center agent Itumeleng that I would receive a call back as they are tracing the issue (never materialised) and today got told by another agent the same thing. Is this delay tactic a way of ensuring you can bill me again for services not needed, pure *****? I would never use this service provider again, their service is shocking, their teams are not really interested in sorting the problem at hand (keeps telling the customer to email proof through and never call the customer back with feedback), this is just not acceptable, especially in a time where COVID is affecting people's jobs, you would think service providers will be exceeding their clients expectations to retain business, MTN obviously don't need my business. Watch out for Supersonic, rather find another provider in your areas that actually take your business serious.