Thank you for contacting us with your billing inquiry. If you have just recently updated your plan, you might need to wait one billing cycle to see the change reflected.
If you are logged into your account, you can hover over the person icon in the upper right and click on "Plans & Pricing". One of the options should say "Current". If that looks to be the correct plan, check the price there and that will reflect what you will pay at your current contact tier.
I can look into your specific account if you have additional questions, but would need more information to do so. If you would like more specific details, please email social_support(at)constantcontact(dot)com.