Commercial activity by educational insititute

This is for knowledge gain to help a student. She is doing a diploma for Air Hostess training. Last week institute held a seminar on the name of Customer Interface Program and asked students to signed a letter that they are agree to participate. Now they are sending students to various junior college to collect 12th board student's personal data & to promote their institute, and that too during their board examination paper. They dont have permission to perform this activity from respective jr. college hence students are not allowed to enter the premises and these students are standing outside the premises for more than 5-6 hours to collect the data. Institute has not provided any facility, they are just paying a penny amount to do that task. 12th student & their parent objecting to this activity. They are behaving rude. When she complained and refused to participate further, saying "this is a commercial activity and has hidden agenda to use students to promote institute & search for future prospects, also we were not supposed to bear all this, we have paid you to teach us and not to use us for commercial activity, I will participate only if it would have purely education purpose" institute has sent her a letter saying you have signed a letter, you have also signed student agreement at the time of admission and you are bound to participate in this activity else institute will provide a certificate. Please suggest what she can do here.