MATTER NOT RESOLVED

I returned a device that was faulty back to supplier and the person handling my case claims I have no right to return the iteam. Is it my fault for buying a second hand ? Why does supplier have an upper hand to sell a second hand product but don't take responsibility of return items? I need my money back and can scorpion please help me with this matter because the consultant was fuming on the conference call as if my faulty line was deliberate and I have always explained that my line is always faulty on calls .