MCB -- which has 74 per cent stake in Aircel -- said it has not been served with the copy of the chargesheet filed by CBI.
CBI had alleged that former Telecom Minister Dayanidhi Maran had received a bribe of Rs 742 crore for coercing entrepreneur C Sivasankaran to sell his Aircel to Malaysia-based Maxis.
Maxis further said: "MCB categorically denies all allegations of any wrongdoing and will vigorously pursue all legal remedies available in order to defend itself at MCB Director Ralph Marshall given the apparent lack of regard to overwhelming contradictory evidence and the commencement of prosecution before the investigations are complete."
The firm added that it will also seek international investment treaty protections.
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CBI in the August 29 chargesheet charged Maran, his brother Kalanithi, T Ananda Krishnan, promoter of Maxis based in Malaysia, Augustus Ralph Marshall, who headed Maxis's UK based subsidiary Astro All Asia Network Ltd (AANL), and firms Sun Direct TV Pvt Ltd, Astro All Asia Network, Maxis Communications and South Asia Entertainment, Mauritius.
"It was alleged that as quid pro quo AAANL paid illegal gratification to Dayanidhi Maran through his brother Kalanithi Maran, the promoter of Sun Direct and SAFL, in the garb of AAANL's investment in Sun Direct as an over value and investment in SAFL," the firm said.
Stating that the allegations were "unfounded and baseless", AAANL said it will defend any charges that may be levelled against it, its directors and its subsidiaries to the fullest extent possible.