XPS 14 - Wifi issue

I've had my xps 14 for around 2 months now and never had it out of my room. (Next to the router).

I've only just became aware though of the shocking wifi connection I get when further than 10 ft from the router. I tested various locations around the house with a variety of gadgets, phone, other laptops 3 in total, kindle etc. They all held a good connection apart from the xps. It is now unusable as I don't stay next to the router nor should I be expected to sit next to the router to maintain a decent connection.

I've googled and sadly it appears to be a recurring issue with the machine, joy.

I've amended power modes as suggested on this forum, removed mcafee, firewalls etc. The problem is the wireless card. I tested a wireless dongle with the machine and it holds a good connection. This however is not the long term fix I'm after. 

I don't have a home phone to phone the dell customer support and can't really afford to phone tech support. Is it possible to log a support call online/email or request a callback?