Sorry to say I've had exactly the same experience recently. Ordered items that their website suggested were in stock. Waited a couple of weeks for them to arrive and nothing. Sent several emails that weren't responded too.
Oh dear - in exactly the same situation. Phone them next week...
Edited to note that I have just received a full refund and an apology. They seem to be improving and are now responding to emails in a very positive way.
Edited by 90rob, 10 June 2017 - 15:01 .