Byju's — Not started live classes though I paid money

I paid money for my son MITADRU SARKAR's live classes in October for 8-10th standard. But no live classes has not been started yet.I contact so many times in your helpline number but there is no solution till date. Mentors are not at all cooperative.I urge that the live classes should be started immediately otherwise I will stop to pay your company through EMI. My son is already enrolled in your premium app till 12th standard. He is now studying in class VIII. Please do the needful.