What process did you follow to appeal Chubbs, I'm going to after the initial one was rejected.
After i got the letter saying the appeal was rejected, the letter stated to contact the VOA to discuss further. I initially emailed them but they didn't get back to me so i rang them and that's when it turned out they has the wrong plans for my house.
Be prepared though. They will ask for evidence of why you think you're on the wrong band. Get examples of neighboring properties bands etc etc.
I found this site very helpfull.
http://www.moneysavingexpert.com/reclaim/council-tax-bands-change#overpaying