Miele and Hirschs poor customer service

I purchased a Miele oven online in November 2017. At the time of purchase there was stock available for the model I purchased and the money was taken off my credit card immediately. I was contacted by Miele 2 weeks later to arrange for delivery. I was given an oven that was different from the one I ordered and paid for. I have been emailing both Miele and Hirschs since to be given either the item I ordered and paid for, or to return the item which is still in the original packaging and unused for a full refund of my money and both entities have been not responded to date.