Sir, just some suggestions for future customer service. Whether or not you have your suspicions, it is always better to assume someone legitimately needs help.
Immediately accusing does not help anyone and is unnecessary, it would have been better to say something along the lines of:
“Cmastic,
I’m sorry you’re having issues with your site, I can’t seem to replicate the problem on my end, do you mind leaving a link to your website so I can diagnose the issue there?
Again, I apologize for the problems, we’ll try to have you up and running as soon as possible.
Thanks!
Pete”
The only reason I mention these things is because good customer service and plugin support will keep your users happy and more willing to download/use your plugin.
I hope this helps you in the future!
Aidan