The hot stamping is free and I do it for all my bags (if it can be done in a nice place) but on the last occasion they had hot stamped the wrong initials on my Insolite wallet!! They were able to reverse it ( remove the gold and stamped the correct alphabet over it) but I can still see the imprint on the leather of the wrong alphabet.
Oh my goodness, sorry to hear about the mistake they made on your wallet! If you don't mind me asking, was it a new wallet? The reason I'm wondering is because I recently had my new Azur Compact Zippy wallet hot stamped, and they also made a mistake. I requested the small-sized font, and they used the medium-sized font. My SA (whom I've worked with for a while) apologized profusely, and gave me a new wallet that was hot stamped in the correct size. Maybe they can replace your wallet as well, so you don't have the overlapping imprint?