There is no way to contact Steam support chat
https://steam.pissedconsumer.com/customer-service.html , as the company does not provide the feature. However, you can reach Steam customer care through their website. Sign into your account and troubleshoot your issue through their Support page or click the Help, I Can’t Sign In button if you have troubles accessing your account. After answering the standard questions, fill out the form and provide your inquiry details.