Massive inconvenience

I bought a product on Friday and selected the next day delivery. My product only arrived the following Thursday which is 5 days late. When my product finally arrived I open it to find out that it is not even what I ordered. I had to arrange for it to be picked up so that it can be returned and replaced with the correct product and now they tell me that the product I ordered no longer exists in there store. Its now 10 days later and I sit without my refund and no product and hugely unsatisfied.