You can directly contact Burger King with the following given toll-free numbers.
1-866-394-2493 (US)
1-844-576-0546 (Canada)
Note: Please contact only by calling from 7 am – 11 pm CST
If you just want to give reviews and want to share your thoughts then you can do so by visiting the official website here: https://www.bk.com/contact-us.