Zero communication and horrible online shopping experience

I made a purchase online a few weeks ago at which stage the Leroy Merlin site reflected 6 items in stock (and still does reflect 6 items in stock). Payment was processed. Despite this, I then received an email saying the item is out of stock and would need to be ordered from the Supplier. There has been absolutely no mention of how long this may take though. I have sent an email query but have received no response. I have tried to call the customer contact line 8 times and have left my number to be called back on. I have yet to be called back. I managed to get through to someone at the customer line once, who advised that he would need to call me back as he could get through to the relevant internal personnel. Despite this promise of a call back, absolutely nothing. I have tweeted Leroy Merlin's twitter account... absolutely no response again. The level of communication and customer service is shocking to say the least. I have spent a rather large sum of money and still have no idea what is happening with my order. I'll be sure never to use Leroy Merlin again.