Determine your exact TOEFL score and the TOEFL score requirement of the university to which you were denied admittance.
Know that if you were denied admission based solely on the results of your TOEFL exam, some universities merely require that you retake the TOEFL exam before admittance.
Investigate the university's admission policies to determine whether you will be allowed to appeal your denial of admission based on a TOEFL score. Some universities, for example, administer an alternate and additional English test or have additional English course requirements for students who have not met the minimum TOEFL standard.
Consider applying to schools that allow you to appeal the TOEFL test as an admissions requirement. Some American schools will allow you to write a letter, stating that your English is strong enough that you do not need to take the TOEFL exam to show proficiency. You will need to send supporting documentation along with your letter.