Edge = driving you over the edge

To whom it may concern, <br> <br> I have been with Vodacom now for about 14 years and never once ever wanted to change from my network provider until now. We have recently relocated to the city of oppertunity ( Johannesburg) and I was dumb struck by how pathetic the service was in the so called number one city in South Africa. How is it possible to have such bad signal in a place of oppertunity , how are you suppose to do your daily business if you only have the so called \EDGE". Is this a way of saying how they feel about there customers? Do they want to drive there customers over the edge? In today's world of technology is there not something like a signal booster or something that they can provide to customers? <br> <br> """