Appalling Service and Customer Disrespect

I have been a Vodacom customer for 28 years and what I can say is that the service I have received from them this year is uppalling. Recently I have had a really bad experience with Vodacom and I don't even think they care. I will mention just the latest one which is the one that has caused me to give this review. I recently upgraded my data line contract and I signed up for a 1TB home internet contract. The contract was activated on the 30th of September and when I checked on the Voda App on the 1st of October in the evening I saw that my data was now sitting at 633GB. Imagine my shock as this is telling me that I have consumed almost 400GB in two days. Mind you there are only two of us in the house and we only use data for internet browsing and netflix but on these two days we have not used it for netflix. On the 2nd of October I called Vodacom to enquire about this data usage and the consultant I spoke to said to me what she sees on the system is that my product is a 600GB package and not the 1TB as I have mentioned. I then asked her to transfer me to the relevant department where they can assist me as this is not what I signed up for. The next consultant I spoke to said she was going write an email to the relevant department on which I asked her to speak to the consultant that assisted with my upgrade as I still remembered his name. Also to mention without going to details, I also had very bad experience during the process of upgrading my contracts and my products being delivered. The 2nd consultant said she spoke to the guy who assisted me and he will call me, that was on the 2nd of October and now it's the afternoon of 4th of October no one has contacted me from Vodacom. I did ask the consultant if she was sure that the guy was going to call me and she assured me and yet no one has called me. I asked because my experience with raising a complaint with Vodacom, they always say someone will call you back and no one does. One time I raised a complained and I was told that someone will call me and I was called back after 3 weeks when I was no longer needing their assistance. I am fed up with Vodacom and wish to cancel all my services with them. I feel disrespected after so many years of being a loyal customer and having referred so many people to Vodacom. They don't seem to have respect for their customers. I can write a whole book about my experience with them and I am asking myself why am I still with them.