Purchase online no feedback and delivery

i have purchase a Samsung a5 with you, and was told there was no stock, on the 26 May 2015. I then changed my order to the Samsung A7 and paid the difference in. I have tried calling and sending numerous emails ,your international number, doesn't respond, by emailing your customer service i get no response of date of delivery. Whilst inline the tracking says no response. The proof of payment has been sent to you. This is non delivery as delivery says within 6 days from date of purchase , but remains 6 days forever. I'm in need of this phone and I would like an honest answer if you are robbing us by taking our money and not delivering. I intended purchasing a further phone, but hesitant due to your *********** service experience. Ref number below. I would really need to speak to your offices regarding delivery.Your assistance in resolving this will be appreciated.