Failure to meet a day trading call will result in a day trading restriction, meaning you cannot day trade using margin and the account will remain on aggregation for 90 days or until the margin call is met. In addition, if another day trading call is generated within the 90- day restriction period, the call must be met on trade date + 1 or the account will be restricted to closing transactions for 90 days.
If your account has two outstanding day trading calls at any time, your account will be restricted to closing transactions until the day trading call is met. In order to satisfy the margin call when there are two outstanding day trading calls, you will need to deposit funds in the amount of the higher margin call. If you deposit funds in the amount of the lower margin call, you will be allowed to place opening trades but the account will remain on aggregation, due to failure to meet the entire margin call. If you fail to meet either margin call, your account will be restricted to closing transactions for 90 days.
Example: Monday $1,000 day trading call generated.
Tuesday $2,000 day trading call generated.
If $2,000 is deposited, the margin call is met.
If $1,000 is deposited, the account holder can place opening orders but the account is on aggregation because the entire margin call was not met.
If neither margin call is met, the account is restricted to closing transactions only for 90 days.
More information on day-trading requirements can be found here.