First of all, we always keep submissions (unless your project exceeds the total allowed size for any project, which is unlikely) so don't worry. If you have selected a plan, which allows for 100 submissions / month and you receive 120 submissions in one month, then the 20 submissions will be available to you the next month (and count against the 100 submissions quota of that month) or you can upgrade to a higher plan to get access immediately.