She also alleged that demonetisation was a "ploy to transform white money into black and black money into white".
"Crucial files are being removed by Narendra Modi and his office. We will get to know the magnitude of the scam only after Modi is ousted from office. This demonetisation is nothing but a ploy to change white money into black and black money into white," she told a rally outside the RBI office here.
Claiming that the CBI was being "used to victimise" her party because it raised its voice against demonetisation, the Trinamool Congress chief accused the central investigating agency of "using" former employees of Saradha and Rose Valley chit fund companies to create "back offices" in order to come up with "false evidence" to implicate TMC leaders in the scam.
The TMC has been staging a 72-hour sit-in outside the RBI office here against demonetisation since January 9.
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She alleged that "only Modi and two-three of his associates" were aware of the decision to scrap old Rs 500 and Rs 1,000 currency notes.
Banerjee indirectly hit out at a section of industrialists and officials close to Modi, describing them as "part of Modi's team" behind the demonetisation decision.
The TMC chief was referring to the CBI's arrest of two of her party MPs, Sudip Bandyopadhyay and Tapas Pal, in connection with the Rose Valley chit fund scam.
Mamata alleged that the CPI(M) had entered into a "political match-fixing" with the BJP as it was "under the Left rule that the chit funds had mushroomed in the state".