Can you order via some other retailer?
Then, cancel this order?
We had a similar issue, with a Kitchenaid microwave. Only one size would fit into our builtin cabinet.
We got the order in time....but, it was a defective oven. So, they replaced it. The tech told us every appliance coming out of China, right now, is terrible :(
Good luck.
Why would I cancel an order that is being delivered shortly?