Revoke in duplicate bridge
The penalty for an established revoke, as this was, is one trick plus return of the revoke trick itself if you won that. So you would properly have forfeited the 13th trick, plus possibly the 11th trick under the condition above. 

There is also a provision for the Director to assess an additional penalty if required to restore equity. It is unlikely that such a circumstance could arise on the 11th trick.