"They speak as though saying: neither by letter nor through people has anything bad about you been reported to us. Nevertheless, we would like to hear you. At the same time they already express their opinion beforehand, adding: for we know that this teaching is everywhere spoken against. They did not say, 'We oppose it,' but, 'It is everywhere spoken against,' so as to turn condemnation away from themselves."
Meanwhile, as blessed Theophylact reports, "even before Paul's arrival in Rome it had been suggested to the Jews not to accept the preaching about Christ, and not only to the Roman Jews, but to all Jews. In the writings of ancient authors we find that the priests, scribes, and elders dwelling in Jerusalem wrote letters and sent them to the Jews living in every land. In these letters they reviled the teaching of Christ as a teaching alien to God and urged them not to receive it."
Thus "the Jews are speaking untruthfully, or at least not the full truth. If they had heard disputes about the Christian teaching (verse 22), they could not have failed to hear about Paul. They act as though they know nothing about the Christian community in Rome, although, according to the Epistle to the Romans, it consisted in significant number of Jews."