Waiting for Refund

Ordered 3 items from IWarehouse, 2 items came seperately with no heads up that they would be delivered. Both items were technically late, with the 2nd item arriving 19 days after I made the order. <br> <br> I have now requested a refund of the 3rd item, which is equivalent to 2999 or more. They say it will take 3-7 days for a refund which is somewhat unacceptable. This means my total waiting time currently is almost a month.