South African telecoms giant MTN Group said on Thursday Benin’s regulator was reviewing its local unit’s reasons for not paying $213 million in frequency fees for 2016 and 2017.

MTN Benin had contested the size of the fees, saying they were excessive, the company said.

MTN’s fine headache in next door Nigeria has made news headlines for better part of last year into this year.

They were initially hit with a $5.2 bn fine in October 2015 by the Nigerian regulator for failure to cut off 5.1 million unregistered SIM cards as requested by the government.

Security was cited as being behind the move, over fears that Boko Haram insurgents were using unregistered SIMs to plan and execute attacks in the remote northeast.

In December 2015, the fine was reduced to $3.4 billion, then cut further in June last year to $1.7 billion, which at the time was equivalent to 330 billion naira. The payment is staggered over three years.

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