My organization has an issue with scammers emailing support with just a single word. Like just saying the word "Refund" with no additional context. Trying to set up a trigger, it doesn't look like I can filter these based on an exact match, I can only do "at least" a word or string, as seen below:

Of course, I can't filter out that string or word as real users would definitely use it. I also tried filtering out other 'strings' of characters where I just tried filtering out the use of any other letters but that didn't seem to do anything:

Does anyone have a suggestion on how I could filter these?
Also, I have tried looking at many other ways of filtering but there is no common domain or location etc. these tickets seem to be coming from. Captcha also doesn't work for our situation.
Thanks for any help here


Do you have any suggestions for me? Could you filter these?