Free. 70Mbps is a non-standard offering for existing 50 Mbps subscribers as areas get upgraded to handle faster speeds. You'll see this treated as a revised order for BB but without additional charge. Actually I waited a while and they upgraded me automatically without having to go through any processes. If you don't need the extra speed (I didn't) you could safely ignore and wait for VM to do it automatically.
Superuser 2017/18 Use Kudos to say thanks Mark answer as "helpful" only when the problem is solved Please don't send me private messages unless I ask you to. I do not work for VM. The advice I give is based on my best understanding of VM policy and practice. You rely on it at your own risk.
I was getting consistent performance at or closer to 30Mb before I was "Speed Boosted". Now I get 1-3Mbps and if I am lucky it might go higher (5 or so) off-speak. Unusably slow during peak periods though and not really much better at other times