My student grandmother's university staff always uselessly reminds her to consult the university's website, when she already did and could not find the necessary information there. She's been tactful with these staff, as they're not acknowledging the uselessness of their repetition:
Please do not worry about reminding me about the university's website that I already tried.
Please, no need to remind me about the university's website, which I already tried.
She's so bothered that she must withhold herself from grumbling brusquely::
Stop repeating, and asking me to refer to, the university's website: this is unhelpful and useless. I already consulted it and it does not answer my questions.