How to restore a deleted task list

Hello!

Our task list is gone with all collected time sheets. Is it possible to restore it?

Here are steps - what we have done

We created a task list for our team of developers named "General". we used this list for 3 months.
We decided to use milestone features and we created a milestone named "Sprint 4" and using "Associate Task List" added the task list "General".

we can see the list of task using link "Task" and also we can see the same task list using link "Milestones"

We decided to move everything back how it was. We deleted the task list "General" from the milestone expecting that the task list will be just removed from the milestone.
It was a surprise that all tasks in the task list were gone completely including open tasks and closed tasks.

Could you help us to restore the task list "General"?

We use "Express Plan".

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