Prolexic sucks, they are resellers. Go with Black Lotus and make them agree to guaranteed uptime protection they'll do it. You could also clone a backup elastic cloud image on Amazon that ssh's to your secure db and switch to it whenever you get hammered beyond 10Gbps
We were using Black Lotus and runaway from them... And 10Gbps is pretty much nothing for us, we have this on weekly basis and EC2 doesn't have enough CPU/memory to handle our db on a single instance