It is ok! you want to go through the phone? This is my tip, I usually go through in 10 minutes, when you call as soon as the server lady starts talking press "1", don't let her finish just press "1" then you will be directed to another lady (different server voice), without letting her talk, press "0", it will tell you: "wait someone will assist you shortly", if someone picks up, then you are lucky, if not you will be directed to voice mail and asked for the 10 digit number, type the number again: (416) 327-0374, again you will get the first server, press "1", then the second, press "0", then you either get through or get asked for voice mail number, enter (416) 327-0374 again and so on and so on, until eventually someone picks up, yesterday I got an answer after 10 min, during the bad days, I waited for up to 45 min, but it should be fine these days.
I am sure we do not have to worry about the date of birth as when you click the help next to it, it says "this field is pre-populated with the information provided during registration" sthg like that and you wouldn't have been able to register if you did not provide your date of birth. I submitted my application already and although I did not see the DOB like you, that field was not considered empty as it does not appear on the check error before I submitted and I checked with other people they also do not see it and also could submit with no error detected (field is pre-populated...). You can try to call as mentioned above, and please let us know what they say!