Poor refund process

Ordered items on Leroy merlin online store. Made payment. They call me afew days later stating there is no stock of the item and there hasn't been stock of it for months. How to you still allow the product to be purchased from your online store knowing that you have only received the said item once! You took my money and I have to send emails in a daily basis to get my money back! It's your fault that you don't update your systems accurately! As I customer I must bare the brunt. No item and I must wait 7 -10 business days! That's really poor service! Again your systems should not of allowed the order to take place if there is no stock!