Loyal customer - POOR SERVICE

I paid for 3 years R699 for my wifi and not skip one month. When I needed a service from them just once I could not even get through to Vox. Send email - 3 months no respond. Call - 6 hrs and RRRR airtime , the call gets put down in my ear or transfer to othe department. Wattsapp - The case gets closed even without chatting with me. Or send me back to Main Menu. So please Ive cancelled 2 months ago and my Wifi is disconnected .I cannot sign up with another ISP until ive received the cancellation letter or confirmation letter .PLEASE DO URGENTLY PROVIDE ME WITH ONE .