 BRISBANE--BUSINESS WIRE--CSG NASDAQ: CSGS today announced that its long-standing partnership with Airtel Africa has been extended. As part of the enhanced agreement, CSG will provide Airtel Africa with managed services, including customer relationship management and convergent charging and billing solutions to support the growth the company is experiencing through its 14-country footprint across Africa. Airtel Africa actively seeks solutions that support a holistic and seamless IT landsca 