Billionaire Patrick Drahi wants to buy Vivendi's 20 percent stake in Numericable-SFR to strengthen his grip on France's Number two telecoms group and prepare for a possible next round of industry consolidation.br Drahi's holding company Altice and its subsidiary Numericable-SFR said on Wednesday they had offered Vivendi $4.5 billion, or about $45 dollars a share, for the media firm's stake.