I have submitted my app to App Store with demo account credentials. Unfortunately they entered the wrong credentials, rejected my app and sent a screen shot also. But I can see in the screen shot that they entered the wrong password instead of the submitted password in the demo account. I sent a reply to apple through this link
Now my question is: do I have to submit same binary and same demo account again, or should I keep it like that and wait for their reply?
thanks
Yes. You will have to mark issue reported by apple as resolved and again submit the same binary which is already present in your account.
You don't need to change the demo account username and password (please double check your demo account credential). And regarding the binary, yes, you have to resubmit a new binary for this type of rejection.
Note :- when you see Binary Rejected, then you have to resubmit a new binary after changing the build number.
Edit :- You can use Reply option below the issue section to reply to them. They will give you detailed explanation regarding your app rejection on the second day.