Byju's — i am not confirmed them i. e to take loan from zest money

Address:

New Maruthinagar east kothapet, Hyderabad, Telangana, 500060

In dec ending marketing person called me to take byjus product free for 20 days. They ask to pay 4000/- a this amount is returned by them, and they taken my cheque photo copy by what's up. This transaction done through what's up. When i am not interested. After 15 days they called me but i not confirmed them to take the product.
From that day today i told them i can't afford the amount to pay through loan.
But they forcing to take this. Please help me or suggest me what to do.