If you decide to have them peel the old liner and respray a new one I would recommend that you inspect the bed after the old liner is peeled, before they respray. Leftover old liner sprayed over with new could mean "out of warranty" issues later on.
thank you all. Anyway, I quit. and will live with it. someday I might install D-rings.
I tried other option:
1) give a mat, as long as the damaged part could be covered;
2) I quote price from line-X or Rihno, I will pay the difference;
3) spot spray to fix only the damaged part;
they refused all. Sigh. dont understand the logic.