In the next paragraph the Jews rose up and brought him before the procounsel. Gallio was unimpressed with their charges and sent them away. Paul was not beaten, but the leader of the synagogue was beaten.
God had promised Paul protection. Here we read, immediately, that protection was given. Not only was it given God used the Roman government to protect Paul. This was not the first or the last time in Acts that Paul’s status as a Roman citizen was used by the Lord to advance the gospel and protect His messenger.
Point is, we can trust our Lord in our endeavors to spread His Word.