(BBC) Music promoters are threatening to scuttle Congolese singer Koffi Olomide’s planned mega concert in Kenya on Saturday over a 2016 debt. Nsana Productions, the promoters, say the 67-year-old rumba star violated contractual terms for a March 2016 concert for which they want a refund of $65,000(£52,000). Olomide was in 2016 blocked from performing and