It's unfair because you chose tough subjects and got pretty solid marks for them, but not enough to beat the autofilters. The same firms complain because of the calibre of students who apply to them but at the same time they're actively encouraging them to avoid a challenge and study easy subjects at A-Level. It's all part of the very stupid world we live in.
Outrageous though it is, graduate schemes might be largely closed off to you, although I think you stand a reasonable chance with PwC, assuming you can present well at interview. Alternatively, have you considered starting in industry; more firms in industry don't look at A-Levels.