Here’s what consumers have asked with answers from CanvasChamp staff and previous consumers.
You probably won't. They do not care about the customer once the sale has been made.
I had the same issue - paid an extra $40+ to get it shipped by a certain date / expedited... day of expected delivery came and I call to find out they have just started printing it - IN INDIA... no way it can possibly ship in time for the wedding it was purchased for!
I cropped my stuff to get it to look right and to not say, like, "low resolution" and they came out beautifully.