Pathetic service

I was on SADV and had great service. Internet speed was good and I received the service I was paying for. Suddenly my fibre line became so slow and it took over 3 days to download a 347MB file. Our Zoom sessions became pathetically unstable and would time out. I could no longer run VST connect which I use for work purposes. I only now found out I was moved onto vumatel with no prior notice. My old DSL service with Telkom was far more stable than this vumatel so called fibre line. I log a call and a "reset" is done and my line runs "ok" for a day and then drops back to pathetic speeds. I then also receive an email advising my line speed and cost will be adjusted to vumatel cost (higher) and speed (slower). So I am going to pay more for less???? Do not make use of vumatel.