Consumer Redressal

i had given my nokia lumnia 625 to the nokia care service centre ekdalia brach kolkata.they were supposed to return my fone with the commenced date..but repetedly after visiting they tell me it will take few more days.even they gave me in written that it would be delivered by decided time..it is a real harassment to visit the Nokia care repeatedly and not getting any positive reply.they keep me waiting for a hour or so and they return with excuses .