Samsung Sgh U 900 Mobile — poor quality

Address:

Gwalior, Madhya Pradesh

i have bought sgh u900 (imei no is 355990/02/089836/0*) last 2 year.. but with in one year only i got in trouble regarding its service. problem was that its upper part touch screen and upper portion keys were not working..then i went to take help in samsung service center they have change its FPCB one time.. but after some the same problem occured.. after that again they changed same part.. till now three to four time it has been repared.. but after that it is not working...
i have also problem regarding samsung service center gwalior madhyapradesh..they do not give good service to custmor...also they take many rupees for part recovery.. service center MUST be changed...

so please suggest me what should i do now?? my mobile cost was too high.. so can i consider that samsung loots consumer. its mobile is only for 5 months use.. !!