faulty phone

I upgraded on the 1s of august to an honor 200 lite. i sent the phone in on the 15th august as the battery wasnt lasting. i got my phone back on the 4th of September to my surprise my phone was doing the exact same thing as to when i sent my phone in! why must i pay for a brand new phone when they just keep fixing it! I only had my phone physically with me for a whole weeks, its been more in repairs than i have actually used it. i do not want a faulty phone back again!