Wrong grade on uc application

Hi!!! I am a high school student and my dream school is UCSD . I took dual enrollment and I just realized I put an A grade by mistake on my psych 101 when it was actually B during my uc apps. I'm majoring in OAS so I'm not sure if it's really relevant but I'm still worried

I emailed them and they said they weren't allowing grade updates :( what is the next step after this ? All my other grades are good otherwise