Byju's — Cancellation of byju's study

We have registered in byjus study one month back. Initially what they have told after registration 15days trial can get and study. After that we will call to you confirmation of further study but no one call and take the confirmation from us. So that we have decided for cancellation and directly talk to byjus team. They told can't able to cancell after 15days trial. I told them after 15days we waited for your call but no one call to us. Then how can accept your answer. Then I was written the message for cancellation many times to support team but still no reply from byjus team. So I am requesting this time also please cancell our study registration immediately.