We are going in September, and I recently bough the Canadian Resident 5 day tickets. I bought the 5 day package as it was cheaper than a 4 day standard priced ticket, but we will only be using 4 days. Now this morning they have discounted 4 day tickets for our timeframe, to the point that there's almost a $300 difference to our party of 4. Will they let me change to the cheaper option, or am I stuck with what I have purchased? We are also staying on site but I purchased the resort reservation separate from the park tickets.