GuestTek – Contact Us Suite 600, 777 8 Ave, SW. Calgary, Alberta Canada T2P 3R5. E: sales.info@guest-tek.com. T: +1.403.509.1010. For 24/7/365 technical assistance, please use the buttons. below to find the appropriate num Suite 600, 777 8 Ave, SW. Calgary, Alberta Canada T2P 3R5. E: sales.info@guest-tek.com. T: +1.403.509.1010. For 24/7/365 technical assistance, please use the buttons. below to find the appropriate number to call.