Samsung — Worst service

I purchased samsung galaxy grand neo on 3sep2014. after some days there was battery problem.so I visited samsung service center.after 3months my problem got solved.
afte1 month my phone was not vibrating so I visited service center once again. this time the person there told me they doesn't have a vibrator available. so he placed an order and told me to come aftr 3 days.
afte 3 days they told me to come after 2 days.this continued.when after 20days I heard d same reslt I got amgry ovr them so they told me they will provide me screwdriver n told me u urslf change the vibrator or wait till the time their executive is on holiday. I have their call recording for the same.