Game Time Canceled

So last night I started geting the BSOD everytime I play WoW. After a lot of troublshooting I believed the problem was my G15 driver so I unistalled it, then everything worked fine. This morning my account had expired and since I thought the problem was fixed, I renewed it. Then I logged on and got the blue screen of death. I've canceled my subscrition but I still have to pay for this month. Is there anyway I could get this months of gametime removed? I won't be able to play WoW so I dont want to pay for it.