@SimonePeters123 Welcome to the community!
Here are some ways you can attempt to restore data:
1) You can append "/undelete" to the end of the course URL. So if your course URL was XXX.instructure.com/courses/123456, you'd just go to XXX.instructure.com/courses/123456/undelete -- this will allow you to restore pages, assignments, etc. but there may be still a lost of data.
2) The other way to restore data is to look at your BETA instance, as long as no one's worked in there. The BETA instance is always copied over every Saturday from your live instance. Click here for more information on the BETA instance.
Hope this helps!