// Quick and dirty example
switch($nextId % 6) {
    case 0:
        $salesperson = 'SalesA';
        break;
    case 1:
    case 2:
        $salesperson = 'SalesB';
        break;
    case 3:
        $salesperson = 'SalesC';
        break;
    case 4:
        $salesperson = 'SalesD';
        break;
    case 5:
        $salesperson = 'SalesE';
        break;
}

teams

id   title  ratio
1    TeamA  1
2    TeamB  2
3    TeamC  1
4    TeamD  1
5    TeamE  1

enquiries

id   team_id enquiry
1    1       something
2    2       something else
3    2       something
4    3       something else

SELECT e.id AS enquiry_id, e.enquiry, t.title
FROM enquiries e
JOIN teams t
  ON t.id=e.team_id

enquiries

id   enquiry
1    something
2    something else
3    something

$teams = array();

$query = "SELECT id, title, ratio FROM teams";
$sql = $mysqli->query($query);
while($row = $sql->fetch_assoc()) {
    $teams[] = $row;
}

$query = "SELECT * FROM enquiries";
$sql = $mysqli->query($query);

$team = 0;
$i    = 0;
while($row = $sql->fetch_assoc()) {
    if($i >= $teams[$team]['ratio']) {
        $team = $team == count($teams) ? 0 : ($team + 1);

        $i = 0;
    }

    $teams[$team]['enquiries'][] = $row;
    $i++;
}

print_r($teams);