NEW DELHI: The CBI had recently received a complaint through CVC against Aseervatham Achary , a key witness against former telecom minister A Raja in the 2G case , accusing Achary of amassing disproportionate assets. The complaint was sent to the agency on an MP’s letterhead, but investigations have revealed that the letter was forged to implicate Achary.Sources in the CBI said the complaint was sent to it and Achary’s employer, railway ministry, in November. On receiving the complaint, the CBI had initiated a probe against Achary, and also spoke to the MP whose letterhead was used to file the complained.The MP denied sending any such complaint to either the CBI or the railway ministry, prompting the agency to shift focus on the person who could have forged it.Raja had raised a point in his defence during the trial on Monday that Achary decided to become a CBI witness because there was a disproportionate assets’ complaint against him. But during the cross-examination, Raja’s lawyer Sushil Kumar failed to make him concede that Achary implicated Raja, or that he decided to become a CBI witness because there was a disproportionate assets’ complaint against him. Kumar alleged that Achary leaked the 2G scam to a newspaper because Raja had not supported his political ambitions of joining Congress.“Achary became a CBI mole in the telecom ministry as early as October, 2009, which was months before he was called in for questioning by the agency,” Sushil Kumar alleged.