Congratulation, you fished me out... (Pixiv Fanbox)

Context: A guy who usually DM me to buy packs, has been waiting for my new pack since months ago. After a long wait, this pack isn’t the usual price and he considered it too expensive, therefore he bought the JPG version. Even though before purchasing I showed him a small screenshot preview, and in the past months I did hint and show him what I have been working on, he is disappointed at the drawing set. Then our direct message just becomes him constantly complaining about how he feels the drawing pack is a scam. Before purchasing, he asked if premium price means higher resolution. Most of the mature girls are around 4000px+ tall (the usual resolution I draw in). The grand scene is 10000px wide which makes it bigger the onsen scene, which cost the same price with less variations. I already explain beforehand that JPG version is a compressed version of PNG, and that both version shares the same resolution. The only difference is when zoomed in, the JPG version image quality won’t be as clear. Upon downloading the files, he complains Zeppy’s picture is less than 1mb, accusing me for compressing the image too much therefore calling me a scam. But Zeppy is a very short girl, drawn in the same canvas along with the mature girls, so of course her file size will be much smaller… All previous JPG packs are also small file size, I don’t know what he expects. As he keeps bashing me for being a disappointment, I feel more and more sad eventually I stopped replying. The last message he send me though, he says “When is your next pack? You used 6months to draw this pack it is very disappointing.” First of all, I don’t work for him… He been asking me, checking up on me, showing his disappointment as if he is my boss… This set is funded by 3 amazing friends, and they have high enthusiasm to this drawing, so I actively discuss this drawing with them, and adding stuff they like etc. Not to mention I am not a professional artist, I am honestly not good at drawing and has tons of things I need to learn… throughout this drawing I have to go back correct lots of stuff, redraw and redesign tons of stuff on the outfits. I got my own personal life too, I have been sick, occupied by other shits, and also need days off for stress relief… Sorry I am a slow artist but it is just how it is, I am only human after all… With the ban situation on with Patreon and Gumroad, I already at my lowest point, lacking motivation to draw. I don’t expect him to understand any of this situation as a customer, but to ask for a refund simply because the pack isn’t what you expect it to be? Utter nonsense, that’s not how it works?? After talking to the funders, I agree it is best I just not bother with him anymore, as I shouldn't waste time on someone that shows no respect to both me and my art. So if he is THAT unsatisfied with my works, it is best for him not to buy anymore drawings off me, this way nobody will be disappointed. Anyway, sorry for the rant… Honestly after drawing such a big set, but keep getting talk down by someone, even though he isn’t a funder of the project it still makes me quite sad not gonna lie… Might be for this reason, I am currently struggling on making new sketch… I will just have to somehow push through… wish me luck.. (´；Д；｀)