mismatch of gstr-3b and gstr-1

my gst liability for july was 25000 but i filed the return for 49000 and in gstr-1 i filed the correct return of 25000,so my qs is that when will i get my credit and while filing gstr-3b of august can i use the credit or i'll have to pay the liability of august as of now and the credit benefit will be given me later after gstr-2a and gstr-3?