Bad service from Boardmans Online

I received only part of the order that I placed through Boardmans online. When I made enquiries via their call centre I kept getting lengthy explanations (that have nothing to do with me as the customer), but I still have not received the missing item. The particular person I dealt with at the call centre was supposed to get back to me on numerous occasions, and never did, not even via e-mail. I am incredibly shocked that in this day and age of online shopping that it is so difficult to locate a missing item. I am getting absolutely no help and what's worse, I think the call centre is screening my number, as they either immediately hang up or they just don't answer my calls. Very disappointed, will not be shopping online at Boardmans again.