My Rooms Removal Regards

[Tech Developer]

Hi sir,
       I have installed openmeetings 3.1.1..
After each users signed up, 2 rooms created for them
in my rooms(example room no 30,31) section. even though i
delete that rooms in admin area again when user logged in
another two room(example room no 32,33) exist..
         I don't want my rooms section for open meetings what i do?