You know, it should be covered by some sort of manufacturer warranty (especially at that cost), and I would maybe not elaborate on how you dropped it, but perhaps tailor the language to the fault of the lens (perhaps the rear mount was inexplicably loose?). Sounds sneaky, I know, but it is an expensive lens, and by any barometer of customer service and compassion, a manufacturer should have the good grace to fix it for you FOC, no questions asked. I would include a polite letter to that effect.
I usually use an EM-5 now, but in the summer, I was photographing eagles with my Nikkor 70-200mm attached to a D600 body, and I stupidly left the zip open on the side of my bag. The force of gravity acting on 1.5kg of zoom attached to my 890g camera drove it into the gravel below and…well, I won't paint a picture. The lens was fine but the camera body was hammered. Anyway, I drove it down to Nikon UK the next morning, warranty papers and all, knowing that my stupidity wasn't covered by warranty. I just told them that the autofocus stopped working (which it had). Took them 6 weeks to fix it (they had to wait for parts to arrive), and all that time I was dreading the final bill. (Couldn't be without a camera so I got the EM-5 to fill the time, and ironically, it's now my go-to camera.) Anyway, they returned the camera body, along with the bill: £0.00.
SO relieved. It may have helped that there were so many people displeased with the D600 (I wasn't one of them), and they just wanted to get them out of the way. Who knows.
But my point is with expensive kit I think you are probably owed some leeway, and the customer service does pay for itself in the long run, a fact that is increasingly elusive to most companies today.
Good luck.