Broken Cart

I have an issue with my cart, please see below: 

I am unable to add anything to my cart. I have tried another machine, cleared cache and cookies and still unable to add anything. 

I have spoken with MULTIPLE technical advisors who cannot resolve the issue.

Can anyone please point me in the right direction (Support wise) as all I need is someone to go onto the back end and clear the buggy cart.

Thanks in advince,

Terry