poor service

i have a Samsung s4 cellular phone , it happened to just shut down so i took it in for repairs at Dion kolonade Samsung . they assured me that it will take maximum of two weeks . it has been almost six weeks now, im without a phone at the moment. every time when i call they tell me that they are waiting for stock, so what if they wait for stock until 2016 am i going to wait that long? i feel like i am not being taken seriously and it is upsetting me because i thought highly of samsung but after my experience i am highly dissapointed.