Nedbank homeowner insurance policy cancellation request.

A simple claim on my homeowners insurance. 9 telephone calls & still unresolved. Two emails requesting cancellation of policy & confirmation thereof.... Unacknowledged. Three calls following up on mails to confirm policy cancellation. No confirmation received. Call centre operator said no cancellation date was provided on my initial instruction. Cancellation date was clearly stipulated. Requested that policy cancellation be confirmed per return email. Call centre operator rep**** that it was not possible to send such a mail. Request to speak to a manager denied, told no manger available. Message for manager to call back unanswered. Unspeakably bad customer service! Beyond insulting to be treated with such obvious contempt. I have taken alternative cover & provided proof of such & now just want to cancel my policy. How can it be so difficult?? Shocking reflection of the Nedbank Group!