I have completed the course, but it is showing my old certificate.

Log-in to https://www.riscus.com/my-account/

Go to My Courses

Click on the "RESUME" button

On the bottom of the page, under the Certificate section, click on the course name.

Now click on the "COMPLETE COURSE" button

Your new certificate will be displayed on your screen, you can save a copy on your computer or print a physical copy.