Micromax Canvas A114 — Rather to solve one problem, they created another one

Address:

Chandigarh, Chandigarh

My phone a114 volume key was not working properly, so i went to the service center at manimajra / chandigarh. Service incharge mr. Arvind vashisht ([protected], [protected] micromax check point, 824, above indian bank, nac manimajra, chandigarh) . There they get my sim card and memory card out and place the phone with them in the service room.
Then i dont know what they have done. I request them not to update the software, i[censored] will then please give me my phone back once to generate the back up, when i receive my phone back then i found that my phone's touch screen main three buttons were not in working and i was unable to use the phone.
Even i was not able to generate back up.
And in response to this the service team tell me its not our guarantee that if in any kind of repairing anything damaged or stops working etc.
After then they tell that they will change my phone's touch screen because my phone is in warranty. But i was not able to take the back up, so i took my phone back and returned home back.
Now tell me what to do with the phone and with the thousands of contacts.
Their team is not taking the responsibility to save the data even.
Tell me what to do.

[protected]@yahoo.com