Fibre - What a mess......No more hope to receive any service or any feedback

Vodacom was overcharging me for my fibre package each month and I then contacted them in July to correct this. I had signed for the updated and reduced monthly amount for a 50/50 line @R699 per month and all was well until the beginning of Oct when Vodacom decided for me that I needed to be charged R899 and automatically be moved to a 100/100 line. They then backdated this amount for two months meaning I have to know pay them R400 extra for a service I have never approved and specifically asked to have the amount reduced. If I know what to "downgrade" I have to pay fee....for something I have never approved or asked for in the first place. Speaking to the call centre is something I would never wish upon my worst enemy as no manager is ever available and everything is always "escalated" for quicker response, but still no feedback or response is ever received. I have 3 service requests numbers, and also proof of the service I had signed up for, yet I am still sitting here with an invoice stating I have to pay more that what I had agreed to. I will be taking this to the Ombudsman. When you try to be responsible when it comes to affordability and payment of accounts and big companies with no regard for their clients are telling you that you need to pay them more even if you cannot afford it. I suppose this is the new norm.....