Negotiate Foundation Year?

Applied for Computer Science with Foundation year (because my GCSEs were really bad when I did them in 2017) in January and now I'm regretting it.

I guess negotiate makes it sound a bit mad but my offer from Sussex uni is for 12 Access credits at Distinction and 27 at Merit, I'm on track to do 33 Distinction and 6 Merit.

Do you think I could talk to the admissions people and see if I could drop the foundation year? Has anyone done this? How did it go?