Inconvenient online shopping that is stressful

On 21 October I purchased sale items on the Boardman's online website. I expected delivery within 2-5 working days as per the invoice they sent via email. I then called the call centre on the 5th day to track my order, I was told that my order was miss sorted as certain items were out of stock hence delivery was late. I then told them that someone could have informed me in time as I was under impression the items were available as advertised on the website. The call centre agent informed that their system only updates every 24hrs and that some items maybe out of stock at times. I then told them they could send the available stock of my order and try to source the unavailable stock as I am not interested in a refund but would merely like my purchases. I was told that the courier company would deliver the rest of my order.<br> <br> I called the call centre a few days later and I was informed that the order was out on delivery but the courier company said they had not received the items from the store and the store said they had handed the items over to the courier company. Days later, both parties are trying to locate the paperwork for the order even though the matter has been escalated