Unfortunately things tend to get a bit pot/kettle when it comes to political advertising.
I don't know where you get your information from. Is it commercial tv? In any case, I wonder how many of the election claims of both major parties are actually based on scientific evidence or other research, and how much based on ideology and the results of polls and market research.
For instance, over a 5 year period we received just over 22,000 asylum seekers (and remember, it is legally permissable to seek asylum, according to international conventions to which we remain a signatory party.) According to the ABS "The latest one million people were added to the population in less than 2 ½ years, which is one year less than the time taken for the previous million to be added, and almost two years less than the time taken to add the million before that. " (ref:
http://www.abs.gov.au/AUSSTATS/abs@.nsf/Lookup/4102.0Main+Features10Jun+2010) In other words, asylum seekers are not responsible for the rapid population rise, and the numbers are insignificant compared to other migrants and natural births. You'd never know this from all the hysteria over asylum seekers and boats, though.