Vodacom cancellation procedure

I have been a customer with Vodacom for over 30 years. I currently have 6 different contracts with them. I want to cancel one of the contracts as I got a better deal on fibre connection. I have been warned that this does not happen easily. This is the worst service ever from them. Previously I dealt with the Illanga Mall branch in Nelspruit without any hassles. I can only commend them on a perfect customer service performance. It appears that there are different standards for Vodacom Head Office and their branches.

I am currently in Liberia and cannot connect via phone on their toll free numbers. So I tried the Chat. I chatted with 4 different people to be either just cut off or given some reason and then they disappear without waiting for a reply from my side. I do not have all the info at hand apart from all my personal detail which nobody else have. I reiterate that I only want to cancel the one line and it will not bankrupt a big company like Vodacom or am I wrong.

Can someone out there just damn well assist me properly?