I think you're in the wrong place. Even if whoever hacked you is using certificates from Let's Encrypt, all that Let's Encrypt does is ensure that your connection to the hacker is secure. It's technology that anybody can use, for good or for ill, and probably isn't anything that anyone here can help you with. Your best best is to contact whomever you get support from for your device, and if there's some specific domain name that doing something nefarious you can report them to their hosting provider or registrar.
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