No, you can checkout as a guest, but creating an account helps track orders and manage future purchases easily.
Help Center
Please use the below form. You can also call customer service on +1 (973) 435-3638.
Contact Us
The Contact Us section informs customers that for urgent concerns, they can use the live chat option to speak with a Customer Service representative.
Additionally, it notes that refunds are processed within 3–5 business days after the returned package is received.