With millions of submissions coming in, they cannot answer each person. So, the only way to know if it's been accepted is if it comes up live on the page.
It can take between 2 days and 2 weeks to fully process. So, it's been over two or three weeks and they are still now showing up, you can post the submission ID numbers here and staff here can check on status. Further, if they do not show up, you can add evidence by uploading a pic of the your name on the on screen credit roll or send a link to page editors via http://www.imdb.com/helpdesk/data_verification
You should always double check the processing times page too for info on how long you should expect it to take (but of course a backlog can happen any time if a lot of submissions come in at once) Data Processing Times