I realise now that they don't have any intention to discuss that situation.
Well, they will have to if your lawyers take the case to court. However, be sure that you have all the evidence to support your case. I'm no lawyer but you're going to find it a hard slog trying to prove the landing was heavy enough to injure 5 discs. Furthermore, you have already admitted that you were not sitting in your seat correctly. That may be used against you.