Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_77 (goal_difference INTEGER, losses VARCHAR, points VARCHAR, club VARCHAR)

### Question ###
Which Goal Difference has 28 Points, and a Club of cd cartagena, more than 15 losses?

### Accurate SQL ###

SELECT MAX(goal_difference) FROM table_name_77 WHERE points = 28 AND club = "cd cartagena" AND losses > 15