cancel subscription

I want to cancel my subscription, however it says that in order to cancel it I have to pay an extra £24 as it is an annual subscription. I want to dispute this. I  never agreed to an annual subscription. I always payed monthly. I was recently given a special offer last time I cancelled  but I never agreed to take up an annual subscription as I cannot afford.it. Problem is there is no way to contact adobe to let them know I am not happy about this. When I try to use chat, it says I have to contact my administrator, or that I do not have access. No one answers the phone. I just want an email address I can write to to let them know about my dispute. I have asked if the bank can raise a dispute but they said I have to contact adobe first.

Should I just tell the bank not to accept any further payments and forget about it or can they take further action against me?  Seems unfair that it is impossible to cancel without getting charged a penalty. Rather a catch 22 problem. sorry I was forced to click a topic but none were relevant.