Vodafone India — vodafone internet - billing

Address:

Ajmer, Rajasthan, 305001

I bought vodafone internet dongle from vaishali nagar branch, ajmer in february and prepaid ₹3000 for 3 months as told by the agent on informing him that i only need this service for that much time. The data according to that should end in april but it continued to work in may as well. On informing the outlet about the same and willing to pay for the usage of may month, they continue to send me the bill for the following months even when i stopped using the internet after that.
Today i got a call from the recovery agent, threatening me to pay more than the usage of the may month coz it's my 'faayda'. I'd request you to please look into the matter.