How do I contact customer support?

I have a recent order and when I checked the tracking it is showing that it was returned, however I never received my order and there are no links to chat with customer care or a phone number to call them.  I tried calling 877-275-3355 and 800-624-9896 however whenever I get to order support it just tells me to check online.  I need to speak with someone about the order to find out why it was returned