Atlantic Superstore review: Flyer prices via e-mail

On November 9th, 2024 I placed an order for my weekly groceries, the order was delivered at 3:17 PM that afternoon via Instacart. I had ordered two items from an e-mailed flyer I received on November 7th, 2024 that supposedly were on sale, from November 7th to November 13, 2024. Scotties Supreme White 3 ply tissues (6 pack) for $4.00 per six pack, I ordered 3, I was charged $11.95 per six pack. I also ordered 2 PC oranges juices priced at $3.99 each per sales flyer and I was charged $5.49 each. A few weeks ago I called Atlantic Superstore Tantallon regarding the fact I was not being charged sale prices on the items I had in my cart, they informed me the sale price amounts would be rung in before my items were delivered.

So on these two ordered I was overcharged a total of $26.97. I took the paperwork to Atlantic Superstore Tantallon, which is less than a mile from where I live, is it not reasonable to think my grocery order came from this close store? In any event the customer service people could find no record of my order and delivery. They informed me they could do nothing for me as they did not supply this order. They should have done the checking into where it came from because nothing on internet order/delivery shows a direct store where it was sourced.

I found someone from Instacart who advised it came from Bedford, which is several miles away. I called the Atlantic Superstore Bedford and spoke to someone who was going to speak to someone in the know and they would return my call, it's been a few hours and no response, what do I do, pack up these items and return them at my expense to Bedford? Because it's a substantial amount, I may very well have to.