Sigmonster nightmare II
No, i don´t have insurance. The lens was munt on the tripod at the lowest level (wrong).
You are lucky! You will get a brand new lens now. Ask them in writting about the status with the repair
If they cannot repair/clean or lost it get in touch with your solicitor and ask him to write them a polite letter requesting a replacement lens. You will surpised how quickly Sigma will react.
Seriously doubt this will work, but good luck trying it.