Bad Wifi speed and billing error

I have 2 x 10Gb +10Gb contracts with Telkom, and \unlimited Speed\" wifi,, which I never really used, well I know why, the speed is SLOW, slower slowest. On contract it is very fast but not on wifi - why offer the service if you don't perform - I have tested it at many places, it is the same.<br> <br> I have also seen being on wifi sometimes deplete my contract allocation, I have reported this several times but every time they come back and say I am in error - well I am not, I then as a good citizen top-up my contract.....extra money that I shouldn't pay.... "