So I signed up at was offered 2.99 for first 3 months, however was charged full price of 11.99.

We appreciate you joining the QuickBooks family, @harryjoehickman-.

I'm here to give details about your subscription and charges. 

The discount is only applicable if you purchased the plan. You may have subscribed to the free trial version when you signed up for your QuickBooks Online account. The moment it expires, you'll be charged the full amount automatically. For your reference, you may check out this link: QuickBooks Online pricing.

If you didn't avail of the trial version but were charged the full amount, I suggest contacting our support team directly. They have the tools to check your account and verify the charges. 

Additionally, I've collected some articles you can use to help manage your subscriptions in QBO: 

• How to understand your subscription rates and charges
• Manage billing, payment, and subscription info in QuickBooks Online

If there's anything else I can assist you with your billing and subscription concerns. I'm always around to help. Keep safe!

If you have further queries regarding your payment and subscription in QBO, please let me know. I'm here to assist all the time. Have a good day!