Yeah brother, the btc addys do not match.
Here is the issue, once they get you to send btc to the wrong addy, they intercept all communication after so neither of us know that there has been a miscommunication.
My advice would be to open a new email addy and NEVER click a link or image sent to your protonmail. Even if the image is from someone you trust...download it and put your device in airplane mode before you open it. If it's a link, copy and paste it in and don't open it until you've logged out of your proton.
This has only happened with one of my customers so far, I'll do the same that I did for him. I eat half the loss and you eat half the loss. Just shoot me an email from a new addy and we'll work it out.
Sorry this happened to you bro, we've done a lot of biz together. I wouldn't compromise that over any amount of money, much less a hundred and change.