I've ruined my life! HELP

Yeah definitely sounds like a plan if I do go through with this uni!

Well my life isn't ruined but would like some help.

I had plans to go to a top 25 university to study Finance but I achieved BBD instead of BBC.

I've accepted that I got rejected by my firm but I'm distraught to learn that I can't get into a decent university because of the D I achieved.

I also achieved a B in an AS subject as well as 4 A's in my GCSE's including Maths and English; but these aren't helping me in this situation so what use are they? Surely they should help in times like this?

I've always been an A/B student and my grades over the last 5 years prove that up until I achieved the D. Every university I've contacted doesn't seem to care because of the D. I don't know how I got a D due to the amount of work I put in and I'm shocked, but theres no point getting a remark.

So here I am, going to a university that's rated around 50th when I could've gotten into my firm with BBC and even if I didn't, I could've gotten into a top 20 RG uni through clearing but again they told me the D is why they can't give me an offer.

What would you do in my situation? Retake the year? Or just suck it up and carry on with life?

Without sounding stuck up and arrogrant, the worst feeling is that I know I'm better than than the university I'm going and the D I achieved does not reflect my ability. I've never gotten below a grade C overall in the past years.

Not really achieving anything by making this thread but I just wanted to vent