Can anyone deduce why the bank is guaranteeing an endorsement? My understanding is that I did not endorse private credit and that my deposit was made as "Special" and therefore the funds deposited have to be made in lawful money and returnable to me as lawful money.
I like your stamp but wonder why you demand full discharge? Until I comprehend why you would not demand payment, or even just let that ride inherent with the demand for lawful money, I cannot really discern whether the Bank is obligated to endorse the funds.

I think though, that by demanding discharge you obligated the Bank to carry the endorsement for you, or rather instead of you.