VODACOM Cancellation Dept inadequate service

I requested a settlement letter on one of my contracts. I received the quote, valid for 0 days. It says use your account number as reference when making payment. I tried and it was not accepted. I tried emailing Vodacom using the email address on the settlement letter. It turns out the email address is incorrect. I called in and asked for assistance to settle the amount. Firstly, the person did not know what public recipient to use. Secondly, the reference no he gave me did not work, then he said to use my ID no and that did not work. He then said I must go and sit in a Vodacom Shop for heaven knows how long and do the cancellation there. Surely Vodacom can assist clients who want to use modern platforms to pay their accounts? I then asked the person to escalate the matter. He said he did and that I might get feedback in the next 2 - 3 days. I asked for a reference number and he was not able to supply me with one. He said I can phone back in 2 - 3 days if I have not heard from Vodacom. I already spent 27 minutes on the phone with him. This is absolutely poor service. I have done everything I can to get this account sorted and I got no joy from VODACOM. What more must I do?