Bad Business and Pricing Discrepancy

I had ordered 3 bathmats on special end of December, but I never received an email with my order number even after emailing Leroy Merlin multiple times regarding it. I received two of my three bathmats and have followed up constantly about the third. Only now have I been informed that it is now out of stock even though it shows in stock on the website. This is probably because they over sold the quota of discounted mats but that is not my fault, especially considering I was offered the item at a specific price and fulfilled my purchase.