TL;DR: New BB connection, (previously surrendered) ULD300GB plan (Base-I-H-DLY-20MB-10G-1MB-M), 20Mbps up to 10GB/day, the first week: ADSL data rate stuck at 2048Kbps, after numerous calls to 1500 and a visit to the exchange partially solved my problem, from 2Mbps to 8Mbps. Now stuck at 8Mbps...