I bought my first D750 from Panamoz late November 2014. After a weeks use or so, there was debris in the viewfinder. I contacted Tina @ Panamoz and she arranged collection the next day by UPS. She then contacted me 3 days later saying the camera had arrived in HK. As it was getting close to Christmas by then, she couldn't guarantee a delivery before Christmas so I opted for a refund and the money was back in my account the same day. So 4 days from raising the issue the money was back in my account. I haven't had that good of service when ordering online from companies in this country.
I decided as it was close to Christmas, I bought a secondhand D7100 in this country to tie me over and for Nikon to sort out the flare issue with the D750. I have since purchased a new D750 from Panamoz and it's a newer model and not affected by the flare issue when checking the serial numbers, as Nikon called all stock back I believe and there was a delay of D750 for sale in the world?
I have now bought three cameras from them 2 x D750 and an XT1 and I have had them all delivered within 4 working days.
As for contacting them by phone, they are in HK so remember the time difference. Myself, I have only dealt with them by email.
I have also bough two D7000 from HDEW and to be honest I was messed about with there courier comapny at the time, which was UK Mail. They failed to deliver twice when planned, which was a pain waiting in all day at the time. I believe they have changed from Uk Mail now, but I havent bothered buying any more cameras from them as Panamoz have been cheaper.