When purchasing a product in QuickBooks Online, discounts are included in it that will last for a few consecutive months. When the discount period expires, the billing subscription will return to its original price. From there, they can also decide if they can give you an additional discount based on your subscription.
I want to make sure that your concern is taken care of. Since we're unable to pull up your account in a public forum, I'd recommend contacting our Customer Care Support team to check your QuickBooks account subscription.