I don't find it necessarily honourable to use the clock like that when the opponent is disconnecting. I would've taken the draw. You're not using the clock evenly like that, it was unfair because of the bad connection. However I don't think you can say that this was definitely a won game for you.
It might have not been won but surely it wasn't lost.
Look for example at the Ivanchuk-Dominguez game (2009). This is even more drastic. Ivanchuk was in a winning position but in time trouble he was knocking pieces down. Feeling bad about the knocked down pieces he offered a draw in a completely winning position. You might say that that was OTB and was different but I hope some of you get my point about fair-play.