A CUSTOMERS RIGHT TO TERMINATE SERVICE IF NOT SATISFIED

We had subscribed to a job portal for 2 years on part down payment and part payment in installments. We were not happy with the service after completion of 1 year, and gave them notice that we would like to terminate the agreement. We have paid for the period for which we have used the service. Now the portal is asking us to make the balance payment, even though we have stopped using the portal services saying that the Agreement does not envisage a mid-term exit. We have responded that we have given them notice that we are terminating the Agreement, and that we have paid for the period for which we have used the service. Now they are threatening to take legal action even though we have told them that as a customer, we have an implicit right to terminate an agreement at any time if we are not satisfied with the service, provided we have paid for the service up to the time when we used the service.