Byju's — Demand to pay extra money

I have purchased byjuice package for my daughter for the period of 4th class to 10th class, amount paid 50, 000. after completion of 4th class mentor says that your subscription expired in this year you have to pay a premium for this year for 5th class. Sai prachetan is an employee of byjuice and he promised to all 4-10th class for single payment required then paid 50, 000. To try to speak his he not responded. please dont play business games with customers this is not right way. If prachetan is not related to byjuic then how bijuice payment transactions and 4th class sd card sent through him. why byjuice appointed this type of persons youwant only business or customer satisfaction.