Oh boy
I think the OP has done the only thing he could do at this instance.
He has played them, as (assuming) learned on this forum.
So, whats the problem?? He has been honest about his intentions to the sales person as well as the lounge dragon.
If the purchase incurred fees, who cares what he does with his money.
Did he steal from the lounge and/or LH? No, he was holding a valid ticket.
All he did was using a little loop hole. And the least important one that could ever be in the german / Lufthansa system.
Does one always has oblige the: Tu was man Dir sagt! / Do what you are ordered to!???
I say: well done^