Today Telecentro came to install Internet at the new apartment and we were offered a good deal on the faster connection (1000 Mpbs), especially given the rampant dollar exchange. I have run a test while the technician was still here and the speed was about 400 Mbps. He said to give it 24 hours and if it wasn't up to speed to call to file a claim. He said sometimes it is due to the building cables.
After a few hours it has increased to close to 700 Mpbs. I am on Wifi, as well. The modem-router has a Wifi 6 antenna.