There is a new company recently set up in SI in the cap, they deal in FLT parts, distribution and installation. They are offering a good package with a real wage for the right candidate but you must be fluent in English and Spanish, it isn't call centre, it is customer service and secretarial and P/A duties, last I was talking to the boss he was even offering a Co/Car. It is a real opportunity to make a proper income rather than the usual Stream, Hugo, and all that fly by night stuff.
I doubt they would employ you if you were not showing willing to get involved in the company long term, certainly not for a summer period only, but if you were looking for a career then there may be a chance. Many people profess to speak fluent Spanish and English, but when it gets down to talking parts and technical they fall flat on their faces and so fluent does mean, fluent.
You will beable to find them if you have any half decent research skills, if you fail after a few days to still come up blind drop me a line, I'll hook you up.