Shoppers Drug Mart review: inaccurate pricing

On sunday, march 24, 2019 @ 5:27 p.M. I was in store shopping when I seen an advertised sign for coffee mate (450 g) advertised for $1.88, limit of 4. Put 2 in my cart and proceeded to self check out. Price rang up as $4.79 for both items. Requested help & clerk came and assisted me and I told her the problem with the price inaccuracy I even showed her the sign stating the sale price. Clerk insisted that was a mistake, it was at this point I asked to speak to the manager, some one came out, did not look like a manager never even stated he was the manager. He also stated that was a mistake, although sign stated sale was over on march 25, 2019. He then told clerk tio give me 1 at the price of $1.88. So I lost out of 1 item at the price of $1.88.