There are two scenarios: Either you have been inactive for more than ten days and did not open a ticket. In this case your base was removed due to inactivity, our rules clearly tell you to open a ticket if you will be inactive for more than ten days. We cannot do anything in this case, sorry.
If you did open a ticket and announced your inactivity please update this ticket and let us know. We will check what happened and if we accidently removed the base we will of course refund everything you lost. In this case we need you to build a small base and tell us the coordinates so we can place some storages for the refund.