Urgent! Possible to cancel Order in transit?

Good day!

So i had regretted to my recent purchase with iphone 6s 32gb space grey, i changed my mind and wanted to get iphone 6s plus 32gb instead but the product already arrived in my country (Malaysia) with status transit and estimate to reach me by tomorrow 22th, thursday. Not sure anyone attempting what im asking before, any help would be much appreciated!