Dissapointed customer

Very disappointed on HomeChoice.. I ordered blankets x2 of 3ply 4kg. They send 1ply 2kg.. I returned them. Instead of them giving me what I have ordered they tell me it was system error and they don't have those blankets. And remember they are the one who send specials to us not other way around.. Now um suffering the consequences of they system error.. I did not receive the blankets which I paid for, they want to return the money because currently the special is finished and I ordered on time and paid on time. I told they can give me any 3ply 4kg blanket as I ordered because I am not at fault but they refuse.. Now I don't trust their promotional items because we buy n pay as they advertise.. Um really disappointed. Mind u 1 of the blanket was supposed to be for a friend birthday gift.. I did not have a gift on her birthday.. So embarrassing.. Really disappointed.. I have send lots of emails and screen shorts as prove of what I have ordered and confirmation from their side confirming my order but that did not help.. Now no 1 wants to take the responsibility, it looks like they trying to put blame on me..