No refund

I purchased two items via the Mac online store on the 24th March. On the 29th March I received notice via email that one of the items were out of stock, and was asked if I would accept a refund for the item out of stock and that I would not be charged a delivery fee for the inconvenience caused. The one item was eventually delivered on Friday the 8th April. Only the one item was in the box delivered, although the invoice attached to the box reflected both items including delivery fees. I then proceeded to email Mac cosmetics, using the same email address I previously received response from. I have since emailed Mac cosmetics 3 times with no response or acknowledgement of my issue or complaint. Kindly assist in resolving this problem.