Commmode water level low. Tank will not fill properly. I can close shut-off valve and then open valve and tank will fill quickly. If I flush commode tank will not fill properly until I close and re-open floor shut-off valve. I think the metal braided supply pipe has collapsed internally and not allowing water flow.

Hi lonesoimeinal and Welcome to The Plumbing Page. At AskMeHelpDesk.com.
Which ballcock is yours. Back to you, Tom