I had one site some time ago.. that had a Western Union logo. with no alt tags.. and a file name non related to WU.. They still emailed me with almost an exact form like yours. Most likely they have a team looking for their logos, trademarks.. and bots mining for keywords like “Western Union”, “WU” (combines with payment terms..e tc.. in perceived high risk insdustry like gambling and pharmacy.
They are not singling you out.. just spamming webmasters with their claims infringement.
Take your logos down, all references to WU.. and email them saying it’s fixed. Then they will stop emailing you. (If you wanted too).