Consumer Redressal

I want to inform you that I purchased A Sony handset Xperia U(Rs..12900) on 23rd June 2013. Then within few days touch problem occurred and it was solved by service center. Then after 3 or 4 months later again touch problem occurred and repaired by service center. Now the same touch problem is started again. I contacted nearest service center and they estimated an amount of Rs.5200. for repairing as it is out of warranty ( VALID BEFORE 23rd June 2014) and it is very worthy for me. My question is about the accuracy and quality of authorized servicing that repetitive touch problem (3 times) occur within this duration. Is there any responsibility to provide servicing within my budget? Phone model: Xperia u(st25i) IMEI: 355114054189063