Meritnation — Number of students in class

I taken cbse 9th and 10th subscription for my son yug singh solanki. At time of subscription it was promise to have 10 student batch. Last two month i saw more than 70 student in batach..I want to cancel the subscription..No one picking the phone in customer case..Counselor, , tripti mehara..Inspite of severl call no response...