Most shocking experiences trying to upgrade/cancel my contract as a 4+ year loyal Vodacom client!

I have received the most shocking service and been through such a horrible experience with Vodacom after being a loyal client for over 4 years! Its time for my upgrade and I been considering the very affordable and attractive deals Telkom and MTN are offering with unlimited minutes/lots of minutes and big data packages. When I called Vodacom to cancel my agreement to move to a provider as I am eligible for an upgrade or cancellation, I was convinced by one of their "Sales" retention agents to stay on with them and they will match or closely match the offering I was looking from the other providers. This agent offered me a package that was very good and said he would call me back to finalize the deal the next day. That agent never got back to me and I have now had to call Vodacom over 7 times, and have spoken to over four different retention agents, each offering me certain attractive "deal matches" that are competitive and then they never get back to me and when I call back, they say "sorry this deal is not available" and then try to switch me another package. I have called soo many times and feel I am getting nowhere and I am becoming upset by the terrible experience, service and almost feel like I am being "hustled" and played with! This has been going on now for almost a month as I wanted to get this done since early August. Most recently, their agent Zolile has been offering me options and then the next day or so, I say can we proceed when I finally reach him and he informs me the commercial team is not offering me that deal any longer. It feels like a never-ending game! I really want to decide on if I will stay on with Vodacom which will need to be another two-year contract but am really not feeling comfortable as a client after this shocking experience. It's been a nightmare to try to upgrade or cancel my phone contract and never expected such unprofessional service from a supposedly credible company. I feel I should be treated with some decency as a loyal, premium client as I have been on their VIP Red plans for the past 4 years and hope that I will get an answer on my upgrade ASAP and if not I strongly won't recommend Vodacom to any of my friends, colleagues or business associates. You want to feel like a client and not a number!