The Chief Executive Officer (CEO) of Africa’s biggest mobile company, MTN, has resigned after the firm received a $5.2bn (£3.4bn) fine from Nigeria.
"Due to the most unfortunate prevailing circumstances occurring at MTN Nigeria, I, in the interest of the company and its shareholders, have tendered my resignation with immediate effect," said Mr. Sifiso Dabengwa in a statement.
Mr. Sifiso Dabengwa tendered his resignation with immediate effect.
The fine, which amounts to double MTN's profit last year, was for failing to cut off unregistered mobile users.
The firm was given until 16 November, just two weeks, to pay the penalty.
The company is in talks to reduce the fine. He had been in the post since 2011.
Non-executive chairman Phuthuma Nhleko has been appointed executive chairman for a maximum of six months while the company looks for a successor.
It is thought that the Nigerian government imposed the fine after the kidnapping of a former finance minister, Chief Olu Falae. The kidnappers used an unregistered Sim card from MTN to demand a ransom.
Nigeria is MTN's biggest market, with 28.5 million subscribers, followed by Iran and South Africa.