You will need some additional information to open a ticket. Tickets are created on https://support.ca.com
a) Find out who within your customer "owns" the DevTest license and contact them. They should have a login ID/pwd for gaining access to the support site and their login ID will be registered to their Customer Site ID
OR
b) ask the license owner to contact their CA Account team to get assistance with the ticket. Either party should be able to help you get a ticket opened.
If you have an account on support.ca.com that has been assigned to your customer Site ID, you can login and open the ticket on your own. Simply registering on the site will not be enough. Your account will need to be associated with a license holder.
When you open the ticket, provide the link to this thread when describing the issue and upload pertinent log files, etc. so the support team will have some background information. Additionally, be prepared to demonstrate your issue. These kinds of activities will help you get to a resolution more quickly.