Sony Xperia — regarding repair of mobile phone model no xperia e(ss)

Address:

Karnal, Haryana

i bought above said mobile from jai durga commmunication 18/336 old char chaman karnal on 4/11/2013 pay price rs 8500 in cash. now it became out of order. yesterday on 25.6.2015 my wife &my daughter went to company, s authorised repair centre at model town karnal. they charge rs 114 to check the fault in above said mobile. after three hour waiting they told mobile, s mother board is out of order you have to pay rs 5000 to repair. i came to know that the price of new mobile of above said is 4000. kindly look in to the matter &help us to repair that mobile on right price.