Even as a person born in Buenos Aires, living abroad during so many years changed my accent and whenever I returned, people realized I had a different accent and they used to ask me where I was from. For this reason, when taking cabs, I tried to speak as least as possible, also because I didn't feel like getting into conversations starting with "where are you from?" and I always knew that local people like taxi drivers liked taking advantage of outsiders. Now with Uber, Didi, Cabify it's not even necessary to speak and things are much clear. There is even a kind of Uber ride where you can expressely request not to talk, among other things. Try to use those apps. To schedule a remis or transport in advance towards the airport or Buquebus, I call to make a reservation even a few days in advance and arrange the fee trips with my local remis company or "taxi Ezeiza" which is the cheapest company I found to go from my home to that airport