I have the same issue and it has been going on for more than 6 months now. I have called Cell C's customer care a million times but I do not get any help. The last agent told me that Cell C is busy with upgrades on their towers and the speeds will be restored as soon as the update is completed. That was about 4 months ago and the internet speeds is still messed up. Below is the story of my life. I cannot wait till this cell c contract to expire so that I can leave Cell C for good.