I bought a refurbished Iphone4S - good price - but...

I bought a refurbished Iphone4S - good price - but unfortunately faulty. I returned, explained fault and waited for 5 days. Phone arrived but still faulty. They agreed to replace so I sent back again and awaited a new phone, unfortunately although next day delivery I am still waiting after 3 days and am told that it could be another couple due to some problem with the PO. Umm, fingers crossed.