Pathetic service...again!

I ordered a device in the first week of January 2015. They promised delivery in 3-5 days. After 2 weeks I contacted them, and they said they couldn't get hold of me to make a delivery. (Nobody phoned). In the first week of Feb, after numerous calls they said they didn't have stock, but delivery will take place on 17 Feb. Today (25 Feb), still no delivery and no phone call. Spent more than an hour on the phone this morning to try and contact them, but each time after at least 10min waiting, the call gets dropped by the call centre consultant.