Poor Network Quality - Fibre

I signed up with Afrihost via Vumatel for Home Fibre, from the first month I had network quality issues which were impacting my work. I literally had to send emails twice a week with Internet speed tests screens to show them and nothing changed, I then had to cancel as the quality was so poor I couldn't work. They then gave me a credit note as I gave them 30 days notification, then charged me a cancellation fee and told me I forfeited the credit note. The fact that my reasons for cancellation was the network issue which they were notified about made no difference The only positive experience I had with Afrihost was their client portal - very good.