The SAPS had complained that the advert contains a photo of a police officer firing rubber bullets.
The SABC banned the advertisement because it said it incited violence.
Icasa says the offending part of the advert must be removed.
The DA's Gauteng Premier candidate, Mmusi Maimane, spoke to News Night's Jeremy Maggs, and said the opposition party will review the ruling.
Sekoetlane Jacob Phamodi
Coordinator – SOS: Support Public Broadcasting
* Listen to the News Night interview here.