Does anybody know how to re-open a case re an undelivered item?

[bharata4]

I had a case opened as I never had delivery of an item after a very long period of time. Unfortunately the case was closed due to a lack of seller response, and I now find it impossible to re-open the case. If I type in the order no. nothing is found in the system. 

[john1297576]

"closed due to a lack of seller response, " That is not why it closed,it closed because of your inaction.

If cases closed because of lack of seller response no seller would ever bother to do anything if they could win cases that easily.