Customer care Escalation iPhone 4S

Hi,

I had purchased by iphone 4 from singapore last year and now am in india and phone is out of warranty, to my bad luck phone screen has developed yellowish tint on left side of the screen and now i wish to get it replaced, i dont mind paying the fees.

I had called up the Apple support, spoke to one advisor and further spoke to his senior too, i was told as india doesnt have any retail outlet same cant be replaced in india, but same can be replaced in other countries where there are apple retail stores and preferred would be Australia and HK as my phone was from singapore, i even got the address of HK IFC mall retail store.

On basis of above i arranged the phone to HK through my brother and when he visited Retail staff said as this belongs to Singapore this cant be replaced here and this is so annoying now...that m badly stuck, on basis of CC info i had arranged it to HK

How can i get this case escalated to highest possible level....would request support here...

Thanks...