Vodacom wont allow me to cancel

Vodacom wont allow me to cancel my contract for more than 3 month now. I first contacted them in February, then in April, then in May 2021. I get telephone support, a cancellation reference number and a message, saying I will receive a text message and an email at the end of the month. But then, nothing... Calling them today or chatting to an agent results in nothing since one gets interrupted and the line drops. This is unprofessional and close to *****ing my money.