Doesn't seem that complicated. You have hade you r account for more than 24 months wiothout activity?
T&C chapter 1 §10:
If a Basic Member has not flown at least once within a period of twenty four (24) months from the date of his/her last registered and Account-validated flight, then his/her Card and Account will be automatically inactivated and cannot be used for any purpose (mileage accrual or redemption) ...
So it should be closed. Can you log into the account? That seems like an easy test to find out if it is still there...