Is my phone hard bricked?

I have a Samsung Galaxy S7 SM-G930A. Before I describe the problem, I want to clarify. I did not root the phone, I didn't attempt to flash a custom ROM, I didn't attempt to install custom OS purposefully. This was a phone that I got a few days ago and it worked fine until one night it froze up, made a weird buzzing sound, and then rebooted. It worked a little but kinda froze up. Later it shut off by itself and when I tried to turn it back on it got stuck in a boot loop. I charged it and when I tried to force restart or get into recovery mode I somehow accidentally managed to bump into the custom OS menu and start the download. It shut off halfway through and then went back to a bootloop. I couldnt get the phone into the recovery mode and after a while It became completely unresponsive. It doesn't boot on at all, its not recognized my PC, it charges but the LED doesnt light up. IS this phone hard bricked and did my stupid button mistake have something to do with it. Is there anything I can do besides send it back to the seller?
Thanks

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