Osc, have you tried a hard reset on the phone?
Make sure it is charged. Even if it seems bricked (broken) plug it in and charge it up. You might not get the battery icon but it should still charge, leave it overnight.
Next, the tricky bit. You might need more hands and fingers... and if you wear glasses put them on before you start. Turn the phone off or if it has a removable battery take it out, leave for a few seconds then put it back in.
To start the hard reset do the following:
Press the volume up button, the power button and the home button at the same time. Note: some devices do not have a home button
When the phone vibrates release
ONLY the power button
Hopefully a menu will now appear. When you see this, you can release the remaining buttons. From now on the volume up / down toggle button lets you navigate the menu, the power button becomes the Yes / accept button
Use the volume button to highlight 'Delete all user data' then press the power button to select
Press the power button again when you highlight the Yes - delete all user data option
When the operation completes you should see 'reboot' option, highlight it and press the power button to select.
Hopefully the phone should now reboot to factory defaults, this takes quite a while and you might get a blank screen but do not be tempted to go pressing this and that, just let it be. Any user data will be lost, but that would be the case if it was bricked beyond repair. The system works for nearly all Android phones of which Samsung is one. When it starts you will have to set it up again.
Another thing to do before using the phone is to reset your Google account, the one that was originally on the phone. This is a cloud based security check by Google to stop people nicking phones and factory resetting them in order to sell them on.
Good luck.
Sorry that I cannot help with the clamping, but keeping a rechargeable angle grinder in the boot might help for next time.
Hold off with the above I have had another think.