I think you should email or call them ASAP and tell them your concerns. Once the receipt number is assigned to an application it can only take a higher authority to reverse it and make it usable again . If you can prove that it was a genuine mistake it will be reversed but definitely will take a bit of time. If you go with the wrong number they might ask you to return and pay the money all over again to start the DS 160 application.
Error in Passport Number on usstate.doc profile
in US Embassy and Consulate Discussion
Posted
I think you should email or call them ASAP and tell them your concerns. Once the receipt number is assigned to an application it can only take a higher authority to reverse it and make it usable again . If you can prove that it was a genuine mistake it will be reversed but definitely will take a bit of time. If you go with the wrong number they might ask you to return and pay the money all over again to start the DS 160 application.