I would not wait, march into the manager's office and make it quite clear that you are very upset by this sudden change in scheduling and price. Technically you should be grandfathered in to your price, that is ridiculous that they changed the terms so quickly on you. They knew at the time that you signed up that they would be doing a price increase and not informing you of that when you signed up is contestable.
Get your money back, or fight to be grandfathered into those aqua classes. But now that the schedule is different then what's the bother, you can't take any aqua classes anyway. How frustrating!
"Binging is a descent into a world where every restriction... is cut loose. At its core is a feeling of deprivation.. a feeling you can never get enough. Binges do not signify a lack of willpower or inability to care for yourself. On the contrary, binges are a urgent attempt to care for yourself when you feel uncared for. They are the voice of survival. Binges are the mark of the self that says, 'I am tired of feeling deprived, of being told I am wrong, that I am bad." - Geneen Roth