Taking a dig at PM Narendra Modi, West Bengal CM Mamata Banerjee said, "If you take 'panga' (fight) with me, I will become 'changa' (better)." "During the election, he (PM Modi) becomes 'Chaiwala'. He becomes 'Rafalewala' once election is over," she added. The CM's remarks come after PM Modi's rally in the state's Jalpaiguri on Friday.