Vodacom failing to cancel my contract

I have been trying to cancel my contract for 3months, my contract expired in June 20222 and I called to cancel and it wasn't done, I called again in July ans it wasn't done I called now again in August only then I got sms that it has been done and my number has been moved to prepaid as requested, I want to know why was it not done initially and worse they took my details and told me they will listen to calls and find out why it was done done and refund me to date I have not been contacted to be advised and no refund has been paid.