Sorry for the confusion.
I have check your licenses and inspected the site which have been assigned to it. I can see that you are using X theme and the Ethos stack. Actually the hamburger menu is present. It is just not visible because it is in white color. To resolve this, please change the site link color and link hover color in X > Theme Options > Typography > Site Links.
Or you may also add the following CSS code in the X > Theme Options > Global CSS (http://prntscr.com/evui3r)
Hope this helps.