Airtel — unknown calls and whatsapp messages from notorious men

Address:

201309

I use airtel sim-prepaid i have been receiving calls from unknown numbers (All men). Each time a block a particular no., i receive call from another no.
Additionally i have also started receiving whatsapp messages from unknown numbers too. These calls are very distressing as the dialer talks in an extremely cheap manner. Although i have been blocking the numbers, it hasn't helped in stopping these calls. Kindly look into the matter.