I am also on the rejection list but there is ambiguity, since I have sent them documents timely. As they are not picking phone or phone remains busy, kindly email on as maximum as possible:
fpsc@fpsc.gov.pk
Also request them to upload new list atleast containing Tracking ID provided by FPSC at the time of application submission or some other distinctive mark.

They have used the word "may be rejected" and have mentioned "roll no.s", it rationally follows they will give chance for clearance.