Can only access certain websites

Hey guysHave a weird one for ya...Today I switched from ADSL to VDSL with Orcon. Technician came round and did his thing, got a new fancy white modem. No problems.Once he left we noticed that some websites were not showing. They just come up with Webpage unavailable. However these sites are working for me:www.facebook.comwww.youtube.comwww.google.comwww.wickipedia.comand funnily enough www.orcon.net.nzWebsites that should definitely be working but are not, include..www.trademe.co.nzwww.apple.comwww.tvnz.comwww.metservice.co.nzI thought that it might only be working on sites that are https but when I go to https://www.ird.govt.nz/ and a few others I also get the same error.The weird thing is, is that if I ping trademe.co.nz I can see their IP address.I called Orcon and they have passed this onto their level 2 support but was wondering if anyone where might have any idea on what the hell would be causing this and how to possible fix, assuming there is something I can do on my end.Somethings I've tried:

Using Wireless and Wired connection

Change DNS server settings

Reset TCP-IP stack from command Prompt

Checked Hosts file

Disabled Firewall

Disabled Anivirus

When I connect on smartphone, it connect but says connection but limited. IE I can get Facebook and Youtube but nothing else

Any help is greatly appreciated.