Poor service from Samsung smart care division

I handed in my Samsung galaxy S4 for screen repairs 3 weeks back as it is still under the ADH warranty from Samsung. I was told the repair work will only take 4 days from the day i handed the phone in at the repair center.<br> I then received an email stating that my phone needs a back cover replacement as well, i then asked why would the phone need a back cover because the phone is still intact and in good condition i was then told it is the camera that needs to be replaced, when in actual fact my phone only had a cracked screen the camera was working fine, i did not have any other problem with it except for the cracked screen.The lady who contacted me promised that the manager will call me back that afternoon but no one has been in contact ever since. I have tried to get hold of the lady who was in contact with me but i was unable to get through her phone and i have had no email response. I shudder to think that a reputable to technological company like Samsung can have such poor service and communication. I am in need of my handset and i am disgruntled with the way the samsung Smart care division is handling my issue. My warranty expire is in a months time,