Wrong order receipt

I purchased 2 mattress protectors from homechoice and only received 1 - I then called the call centre and was advised that the other is on it's way - Two weeks later I followed-up again and was told that I do not qualify for the order, as I was only charged for 1 and they will have to refund my money in their account. <br> <br> Not once was I called to be informed of this nor was it told to me the time I followed up on my order the first time and the call centre agent dropped the call when I asked her to hold so I can get my banking details <br> <br> My question is why was I given the amount for 2 which I've paid and only charged for 1 which was no mistake of mine but homechoice's -