Sony India — need refund of my money

Address:

Meerut, Uttar Pradesh

i purchase sony zperia z3 in 45000 on 11 fab 2015 and after few days its back panal crack up itsself ony as phone got heat up so much while using it for a long time.i go ti service center and they they didnt cover it under warranty so i paid for it after that i found its back cover pop out again fron its back side and dead pixel on display and data cabil also stop working all happen at the same time on 6 may 2015 i submit it to the service center.and they are not capeble of repair it and did not repair it till now i call them to refund my money but they refuse there product are so bad and cheap quality they are cheating there customer on the name of sony... no service support providing by them its just a 4 month old and about 2 months it was on sony service centre which is effecting my work and daily life .so plzz help me .as i dont need there phone and will not accept phone now ...i just need my money refund