Unnecessary delay in resolving the issue

On the 23 May 2020 I placed an order for base and mattress set. The order confirmation I received stated that order was for both base and mattress. On the 30 May 2020 only the mattress was delivered. The delivery note I returned stated that the delivery was short. On making enquiries I was told that the order was only for the mattress, and not the base. I informed Homechoice that I require both the base and mattress, but I now have to return the mattress, and then wait for a new delivery which will take another 7-10 working days which is totally unacceptable