Sony India — Sony mobile service center cheated me to generate 3 different service bills for same issue in mobile

Address:	110024
Website:	support.sonymobile.com

On 19 Aug 2015 i submitted my sony experia z for repairing at TECHNOCARE SOLUTIONS PVT. LTD. Lajpat nagar, new delhi, , , then thy give me estimate around 1500 /-, i was approve that amount after that they were not repair my mobile and resend again i now they gave me 5000 rs estimate, i was confuse at that time while that period my mobile return back from them without repaired again i submit my mobile now they gave me estimate of 6700/- . Now i totally confused what should i do ..nobody try to understand my problem they always give excuses to me ..still my mobile is there it been 2 month now ...