Hi djaconi,
I wouldn't advise creating any hrefs that go to a 3rd party site. To me, that is like surrendering your web content and being okay with NOT ranking for that content in Mexico. Depending on the number of potential affiliates you have there, that may be okay.
If you do choose to set the href as Flintel, then you'll essentially be helping with their pagerank. The link love doesn't appear mutual, though. Flintel has a handful of outbound links to your site but does not actually mention "Teletrac" by name on their site (in Chrome, "site:flintel.com "teletrac""). They have your logo paired with their logo in an image but that's it. I don't see any alt text that references Teletrac either.
We're dealing with this same issue where a Russian website has basically created a clone of our US client's site. Even reminding the Russian company that they are infringing on copyright and lowering pagerank of both our sites has not had any effect. Since the affiliate won't rework their content to be unique, it's up to our client to create new, unique content on their own site.