Crashes; doesn’t work; support not helpful

I am plagued with duplicate photos after trying to merge all my old libraries. I’ve tried other generic duplicate removal tools, but they don’t seem to recognize “similars” all that well. I purchased this app with high hopes, based on the reviews.
It has a nice interface and is easy to use. On small libraries it works fine, though it definitely missed quite a few duplicates, i.e. two different digitizations of the same original paper photo at the same resolution. However, it seemed “good enough” for my uses.
Then I ran it on my larger libraries (> 80,000 photos), and it crashed every time. It would choke bout 2/3 of the way through, though not in the same place every time. It was clearly a bug - quite likely in the memory management.
I called support, and a guy from India proceeded to do a remote session on my computer, claiming that the problem was due to some “launchd” notices showing up in my logs. I had a nice argument with him about the irrelevancy of launchd to the app crashing. (If I were the typical consumer, I’m sure I would have been convinced by this guy that there’s something wrong with my system, rather than something wrong with this App. I may have spent countless hours reinstalling the OS or whatever. How many other people have been misdirected by “advice” like this?)
So, after arguing back and forth, I finally convinced him to watch it run. We spent 30+ minutes together on the phone for him to watch it crash. Then he finally admitted that it was a bug.
Nice waste of over an hour of my precious time to find a bug for them - plus the aggravation of having this guy tell me it was my computer rather than actually listening to me. All for a few dollar app.
Can I get a refund for my time and aggravation?

mcgurme about Duplicate Photos Fixer Pro, v1.8.2