Yu Televentures — yureka plus lost by yu service centre

Website:

yuplaygod.com

Hello sir i had submitted my yureka plus handset on october 2016 but still they had not given back my handset. They are saying that yu main service on which my set was transfered had lost my phn and not accepting this fault so my city service centre saying me to wait and given me an old yureka handset. Till now they had not given my brand new handset my imei no was [protected]. Past when i checked my jobsheet status it returned without repair but service centre they had not received my phn but an old yureka. And given me that yureka and closed job sheet but i want my new yureka plus back which was on android 4.4 i had submitted my phn at banda (U. P) service centre but till now not received my yureka plus. Plz help