Unfair Charges

I signed up with MWEB on the 16th of April. At this point it was for a 4mb line as I needed to upgrade the line first before getting 10MB. Not only was it a struggle to get this done, I was throttled almost instantly. Finally I got the 10mb which worked great. But because of the distance to the exchange I requested a downgrade to 6mb as I could not utilize 10 mb speed. This was received and I got e-mail confirmation on the 26th of May. The problem starts that I was billed for a 10 Mb line and a day after payment the downgrade happened. I was instantly throttled and my 6mb line is now a 0.6 mb line. This is 6% of what I was charged for. Ridiculous! I will never recommend MWEB! Best ISP in SA my foot!