I live up the road from you, and have had hell with this, too. Nothing wrong on Cell C's side (obviously), and I'm yet to get a response regarding my ticket. After trying all day (and everyday since Monday) I managed to get on for about an hour, and then the connection just froze again. Tower in question is yet AGAIN 14443!
PLEASE FIX THE PROBLEM!
Still not fixed - its fine when its on EDGE - seems like you can get uploads and downloads, but you are knocked off every 10 min and have to wait sometimes up to 15 minutes for another connection. Its bad! When it goes onto WCDMA you cannot get an internet connection. Surely Cell C should fix this. I went into the Cell C shop in Eastgate and people were talking about it. Had my modem checked and its not that. Surely the Cell c rep can look at this - I am told they are working on it but its now some 6 days with no good connection!