Worst service ever experienced, personal and or business.

What a terrible experience, we have been a supersonic customer for just under 2 years. We cancelled our line understanding the one month notice period which is acceptable for most service providers.. However we have been debited for a period of 4 months over and above our 30 day notice. I have called & called & called again, sent emails to both '***' + '***' asking for help or a response but nothing its as if it's 100% customer avoidance. I have tried the automated WhatsApp line " we are sorry to see you go" I have got 0 affirmation from supersonic.. This feels like a **** or Thievery and as a small Business this is about the worst service I have experience and would like to provide caution to anyone who might be looking at this provider. It is so hard to remain patient and keep my integrity over this experience, I cant comprehend this level of service and MTN should be ashamed as at this level you should get things right