I am not making any judgement on the way the OP handled this situation, but the agent in the lounge seems to have been grossly incompetent. The buggys don't come to the lounge, they give you a voucher and you have to go down from level7 to level 6.
If you were entitled to a voucher, they should have given it to you and told you to head off. It sounds like this agent didn't know what the buggy was and was probably in a holding pattern trying to work out what your request was.
Possibly, but in my experience the lounge agents should know that very well.