Candidates' expense declaration still not clear

Can anyone enlighten me why no action was ever taken against certain candidates - elected or not - who contested the last European Parliament election in Malta, and who declared under oath that they hadn't spent more than the sum allowed by law for their electoral campaign?

It's an open secret that from the number of campaign mailshots we received at home and the amount of advertising carried in newspapers, most candidates spent far more than the maximum allowed by law. Yet they still declared under oath that they did not exceed the limit.

As far as I know a declaration under oath carries a lot of weight and responsibility and is always binding, no matter who makes it.

To take a false oath is punishable by law and a grave sin in front of God. Or are some oaths to be taken lightly nowadays?