Looks like my “friends” at Webfusion are not about to let go. They’ve charged me for another month of service (and I’m using the term “service” very liberally here), and has decided to ignore my queries into the matter completely.
So I guess my next course of action will be to contact my CC issuer, contest the charges, and put a block on any further charges from them.
Update: Fantastic, 3 weeks later and they update my ticket:
We have recently received your email request to cancel. In order to proceed with your request you will need to contact our VPS Team on 0845 0722 881.