I want my money back

So disappointed with the customer service. We ordered wall fans on the 4th of Feb which we were expecting by 18 February. On the day of expected delivery we are called and told they are short-stocked. They deliver only one fan, and when I ask when I can expect the other the only answer I get is "we don't know". I was told they would call me to keep me updated - two weeks later I've still heard nothing from them so I call THEM, and again I am passed from person to person on the phone and each person tells me they don't know. They will call me back. Finally only on the 6 of MARCH, more than a MONTH after placing my order, do they call me and say they're on their way. They are so late and I've had to make alternative arrangements for the deadline I have missed to have these by. When I lodged a complaint and asked for at least a proper discount for the terrible service and inconvenience I received, I was told they could only offer me free delivery on my next order. I AM NOT ORDERING HERE AGAIN BECAUSE OF THE TERRIBLE SERVICE, SO HOW DOES THAT BENEFIT ME?? Terrible experience, highly inconvenient if you need anything urgently. Would never recommend!!