Ok so you were on an annual plan to save money and when you cancelled you had to pay an exit fee to account for the annual discount. Seems reasonable to me.
They gave you a months notice of the price increase and you didn't cancel until after it went into effect?
An annual plan shouldn't require a termination fee. If I purchase an Annual Subscription, I should be able to cancel it whenever, with no fee whilst retaining the benefits for my subscription, as I paid for a whole year up front anyways....
Adobe software being a subscription service is nonsense too, but thats for another discussion.
Take a step back and think of the company who designed this machiavellian scheme and generated this dramatic situation...
is this a business relationship with trust and maturity?