Samsung Battery Problem

As a big Samsung fan I regret to wrote yet another complaint about the Samsung S5, this time for the battery not even lasting half a day! It is known that the S5 battery doesn't last long and gets worse over time. I have heard of some clients having their batteries exchanged, I went to Langeberg Mall Vodacom at about 15:00 with a dead flat battery after being fully charged this morning to complain about the battery life. I Expected the battery to be exchanged due to the fact that the poor battery performance is close to a factory fault. But Vodacom with their innovative procedures wants to book in my phone for 2 - 3 days while the battery is on order. I can NOT do my business without the phone that cost me close to R10 000 and each time there is a factory fault they want to book it in!! I am supposedly a premium customer with a premium device , but I would like Vodacom and Samsung to treat me that way..<br> Thank you!