It is good to have the entire code listed, but could you point out exactly which part doesn't seem to be working?

Not part of your problem but a good to know, tr can take an entire list of characters and transliterate them to a second list, so instead of doing one for each letter you can do something like:

$vNombre=~ tr/αιν/aei/;
[download]

Less typing and probably quite a bit more efficient.