LG Electronics — Service center not returning cell phone

Address:

208011

I submitted my phone at LG service center for screen damage repair.i called many times them but they are not giving my phone.everything they are giving me excuse.now they are not picking my phone.two times I visited center.they are giving me phone not battery.
Today many times call them but not picking my cell phone.
Always say 100% tomorrow.but not giving any how.
2 month already gone I submitted it on 4 October.
It was only display crack.2 month is more than to change display
Even lady who is working there say I do not know when your phone will be OK.