Vodafone India — receiving sms for pending vodafone payment-no.

I am receiving multiple messages and calls from customer care for payments pending for mob no. [protected]. I am not aware how my number is circulated in the portal as they are trying to reach me in every mode of communication.
Its really irritating and torture to keep explaining to the customer care executives
Instead of telling them multiple times they have not yet stopped messaging or calling. Kindly relieve me from this