[Q] Need some help returning back to stock before I get scammd topic

My fiancee dropped her phone, and we paid someone to replace the screen. It's a new screen but touch isn't working properly. I can unlock the phone and then nothing else. They're saying that it's a software issue due to the ROM I'm using. Actually, they're saying that I have "two conflicting softwares on the phone" and that it's the reason the screen isn't working. I don't know if that's true or not, but I really need to get back to stock.

I'm using an AT&T Samsung Galaxy SIII but I don't know which "revert to stock" guide I should follow. I don't know what information I need to know beforehand and what I need to get to ensure I do this properly. Please help me do this the total proper way so they have nothing they can say when it comes to potentially screwing me out of my money.

Thanks so much in advance.

EDIT: I need to know if there's a way to check my ROM/baseband/etc and all of that without a working screen, I guess.

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Written by dd

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