Totally annoyed with service

The service from Leroy Merlin is absolutely useless. I ordered a product online because I went to the waterfalls store to purchase and they said this product can only be purchased online. They said they have stock. After I ordered only 4 days later they reply to say they don't have stock on won't be receiving in a long time. The product was meant for a clients kitchen and I accommodated for this product already. Online also shows they had stock. So why advertise in store and online Firstly if you can't purchase the product in the store and Secondly if they don't have stock then make sure it's states out of stock.