Undelivered order and refund delays

I placed an order on the Boardmans website on the 23rd October 2015 (order number is ***). However, when the order was delivered (on 27 Octobet 2015), I realized upon opening the package that the items inside were not what I ordered (the order number on the invoice inside the package was ***). I notified Boardmans of this mistake and a courier was send to come and collect the incorrect order (Courier IT waybill No ***5) but my order was not delivered. I followed up on the undelivered order a few times and was eventually informed that the item I ordered was out of stock