Blatant errors are still binding until the vendor has complied with the requirements of the CPA, in S. 23 (9). What need to be done to comply with that section is as yet undecided.
Yes, without checking the act, it states something along the lines that the advertiser must correct the prices as soon as possible and inform the public by placing a sign stating as such, with an attached list of corrected prices at the store entrance and attached to the goods in question...