We do not provide replacements for lost or damaged discs. It is your responsibility to ensure that your discs are kept safe, and that you are able to find them as required.
If they discs worked previously (likely, seeing as the helpdesk hasn't been contacted about it before), then they cannot simply become corrupted. They've either been damaged, or your CD/DVD drive is not reading the discs properly (a 'corrupted' disc message can point to a faulty CD/DVD drive).
In any case, this is the sort of thing that should be sent to the helpdesk (albeit in this case the answer is above).
As has been said many times before, a 'blunt' message such as yours really doesn't get you very far with the community. If you want the community to provide assistance, then please remember to be polite.