If I have an existing subscription. How can I get the discounted price?

I signed up for the bronze which was billed at $159.  I then received an email a few days later showing that it is on sale for 50% off.  But it will be billed at $114 for the year.  Please switch me to the updated pricing, or do I need to cancel and sign up again?

According to your terms and conditions, I have 30 days to cancel the service for a full refund.  I would just like to get a refund of the difference.

I have already cancelled your current subscription and issued a full refund so please go ahead and upgrade your account again with the discounted price. 

Do let us know if you have any question.