Both campaigns were guilty of misinformation but the most blatant outrage was the UK government itself spending £9 ($12) million of the British people's money producing and delivering one-sided pro-EU propaganda to every address in the UK.

Edit: For people downvoting the above factual post:

Government's £9m EU 'propaganda' leaflet has left public LESS well informed, study shows:

http://www.mirror.co.uk/news/uk-news/governments-9m-eu-propa...

EU referendum: PM 'makes no apology' for £9m EU leaflets:

http://www.bbc.com/news/uk-politics-eu-referendum-35984991

The propaganda itself:

https://www.gov.uk/government/uploads/system/uploads/attachm...