Hi! Don't know how large your "mudanza" is, but I used Mudanzas Soho a couple months ago. They are on Mercado Libre and on the internet as well.
They charge you by the hour but they work very fast ($200 pesos per hour in September + don't remember how much per extra assistance. I think we gave each guy $100 on a move that took 3 hours - very few items, but they carried everything on their backs 7 floors down and 5 floors up).
A friend of mine who has a store and has moved machinery and furniture several times recommended them.