Vodafone — Harassment regarding port request to Airtel.

I have initiated a port request from Vodafone (VI) network to Airtel as i was facing several issues with network quality of Vodafone. But since having received the PORT unique id I am being harrased with calls to my number from vodafone customer care urging me to cancel my port request. I have already clarified my reasons for porting and have requested them not to call me so incessantly. But it seems like they are unwilling to stop and this in turn is causing be lot of mental agony. I am currently unable to distinguish between my work related calls and Vodafone cuatomer care calls. Infact they are calling me from 'Private' numbers that i am unable to block.

Please help me. I can't take this constant harrassment any more.