Thanks for reaching out. Was the device purchased as an unlocked device or from the carrier? Have you tried updating the device in safe mode? See if that helps.
To boot your phone into Safe mode, start by pressing and holding the power button until the power menu appears on your screen. From there, long-press the "Power Off" button until it turns into a "Safe Mode" button. Simply tap on "Safe Mode" once it appears and your device will automatically reboot to safe mode.
Once you are successfully in safe mode. Navigate to your settings and try updating your device as normal.
So I went to where my mom bought the phone and they told me they couldn't fix it, that I have to contact the manufacturer for my phone to get fix. But I'm afraid I don't have the receipt of the purchase anymore. I have everything else that are inside the box though. What should I do now?
Updates are provided by the service provider. The only option Samsung has for updating your device is through Smart Switch. https://www.samsung.com/us/support/owners/app/smart-switch
You are welcome to take it by a local uBreakiFix location, as they are authorized Samsung service location. They can flash the current software, I believe. https://www.samsung.com/us/support/ubreakifix/