The project publishes no dedicated support address. Its official points of contact are the website at ton-blockchain.github.io — in Telegram bots, questions usually go through the in-bot help menu.ton-blockchain.github.io
Is Acton still running?
Apparently not. It has been moved to the catalogue's archive: either its channel has been silent for over a year, or every link outside Telegram stopped responding. The page is kept as a record of the project.