Leroy Merlin online order a disaster

Online ordering and delivery service VERY disappointing! I ordered 19 items (16 of the same type and 3 of a different dimension) The website says orders take 7-10 days to be delivered, however it is now almost 3 weeks and still no delivery. Have contacted the customer services call Centre yet no one can give me a clear answer on why the order is delayed en when I can expect it. Apparently now 3 items are out of stock yet when I ordered it, it was in stock and I paid for it with no back orders. I cannot get hold of the Strubensvalley branch as the call Centre directs one to the head office and 3 attempts to get the store manager to contact me was unsuccessful. Attempting to change the order has also been unsuccessful as no one has followed up and contacted me after the request. For the last 20 days my order tracking status had been "In preparation" Simply poor customer service support.