Missing items and no refunds

I ordered items on-line beginning of November 2015 and on site it's written the order takes 3-5 days to be delivered but mine took almost 2 weeks and on top of that 2 items were missing and 1 was incorrect. I called Boardmans on-line the same day I received the order and I was told to return the wrong item at my nearest Boardmans (which is Canal walk) and the matter on the missing items will be escalated and I will get my refund as soon as possible. These items were a twin pack of pillows and a curtain, before I received my order Boardmans on-line had called me to let me know they no longer had curtains but they will refund me which they never did. I have called almost everyday (e-mailed) to find out what's happening and I was told that the matter is being escalated and now it's been 3 months and no one has even attempted/border to call me and I read somewhere on-line that this is a trend for Boardmans, they never deliver all the items you order and they don't refund people. I'm so disappointed with them I wish I had google them before I placed my order because I would never have bought from them but being a well known store I never thought they are in a business of ******** people