Faulty device

Please can someone call me. I upgraded via Selldirect and received my new handset 26 June 2015.<br> The handset seems to be faulty as it freezes and the volume level (incoming messages, calls etc) are sometimes louder and softer. I know there is a 7 day period whereby you can get a new handset but if you call daily, hold on for longer than half an hour and nobody answers how can you get this sorted out before the 7 days are over. I have been spending a lot of money holding on via landline and have also exhausted my mobile minutes.<br> <br> My first complaint regarding them never answering their phones got a lame excuse that they had problems with the telephone system - to me this seems a permanent problem that is/will never be sorted