As much as I am sympathizing with you, and knowing how frustrated you feel, I have to let you know about few points I care for when it comes to leather straps, or tbh, reps in general.. and that's an advice for everyone.. No I do not wear the watches constantly, I have a big collection, and I tend to rotate them often, and that would let one watch sit for months without being worn, however, I still tend to wear one watch longer than the other as it could be just arriving, and wanting to enjoy it, or it is close to my heart..
Having said that, I need to state that I do take extreme care of my reps that have leather straps.. as you may have seen, I only buy CF straps for my PP reps, as they are the official makers of the strap for Patek Philippe, and I have this obsession of wanting my reps closer to gen as much as possible.. so to be fair, I have NEVER EVER had my strap touch water, knowing that the material that they polish the strap would fade away, so I tend to keep them away from water in all costs, even couple of times, I took the watch off and put it in my pocket when it was raining.. to protect the strap,and to protect the RG material not to be oxidized.. From the pictures you have shared, it seems that the water was more than just a drop that you immediately wiped off and put the rep away.. I am not accusing you of negligence, I am just trying to put things together, as someone who knows that CF does quality control on those strap exactly the same way they do for their big clients like Patek or Vacheron Constantin or Breguet as they are official makers for their straps.. I guess it's an expensive lesson that you had to go through.. I still would think that CF should have addressed you better, after all, it is a 300 euro strap, and the customer service should have a better service to be honest. I bought from them more than 6 or 7 straps, never had this issue, however, I have to also state the fact that the shine of my older straps from few years, with usage, they had a slight fade, which is normal.. but what happened to your strap is not the coating is wrong or fading, what happened to you is that the strap is unfortunately ruined from something while used, whether shiny or matt, whether CF or another brand.. the strap will definitely be ruined if it touches water, or oil or cream, or perfume. That's why sports watches go with bracelets as the company figure it will be worn around water and water activities.. I am sooooo sorry that this have happened to you, and I feel your pain and frustration, I would be also upset, but I beg you, never ever ever bring any watch with genuine leather strap close to water, heck, I would suggest you, never even wear the watch with genuine leather strap when the humidity is high in the weather.. I don't know where you live, but this is something that might have never crossed your mind, but if you live in a humid place, or it is the season where humidity is higher than usual, this would be the main reason why this happened. I truly hope that you would get somewhere with CF. honestly, when I bought my last strap, the personal relationship that I had with them is not the same, they didn't even know that I bought all those straps, or they just didn't care.. wasn't as good as it used to be, I heard the same from few members here, but I still like their straps just for the fact that they do the exact same ones for PP.
good luck with your interactions with them, I hope they would consider reputational risk and help you resolve this issue..
I hope you take this message with the friendliest friendship from my side, and wouldn't upset you, cos that is definitely not my intentions
my best regards,
PS, btw, those tips should also go for any RG or YG plated reps not only leather strap reps..