I've got a question, maybe you can help? Is Bancomer Transfer Services an actual American company, or is it actually a division of a foreigned owned bank? I found this article, thought you might have additional or more recent info (long, didn't read it all).
The wire transfer division appears to be based in the US. However, the parent company / the bank that it operates through is definitely has a strong presence in Mexico. Bancomer is one of Mexico's largest banks. Additionally, "Bancomer Grupo Financiero" is Mexico's second largest financial group. However, it operates throughout Central America, Europe, and Asia. I can't seem to find where it is based. Their websites are all in other languages. From your article, it looks like it may be Spain?