Fibre downgrade

Vodacom Fibre - Vodacom automatically upgradeded me from a 10mb uncaped line to a 75 mb uncaped home fibre line. I called Vodacom and they explained that the 10mb line is not availible anymore but they can downgrade me to a 25mb uncaped line. So the service request was done on the 01/05/2024. (SR***). Today (26/06/2024) when I enquire again Vodacom said everything is done from their side and they are waiting for confirmation from the fibre contractor. Hence my next billing will be again for the 75mb line on the 01/07/2024. I exllained to Vodacom that I can not affort to pay the amount of the 75mb fibre line and I ask if they are going go refund me hence I did not ask to be upgraded to the 75mb line. Vodacom refused and said as long as I am still on the 75mb line I will be paying the 75mb and even if they migrate to the 25mb line I will not be refunded at all.