The Nigerian Communications Commission (NCC) appears to be playing hardball with MTN Nigeria over a US$5,2bn (R71bn) fine it has imposed on the company.

According to a report published by Nigerian newspaper Leadership, the NCC has suspended all regulatory services to the company until it pays the fine for failing to disconnect more than 5m Sim cards that had not been registered under the country’s strict Sim card registration laws.

The newspaper said, too, that MTN is facing a probe for 28 “accumulated breaches”.

It quoted an NCC document, which it said it had exclusive access to, as saying: “As it stands today, MTN’s persistent violations have forced the NCC to impose the unprecedented sanction of suspending all regulatory services to MTN following its accumulation of over 28 separate and proven infractions”.

“In the NCC quarterly compliance enforcement report for [the second quarter of] 2015, out of the six sanctions imposed on operators for various acts on noncompliance, MTN was involved and sanctioned for four separate infractions,” the NCC document is reported to say.

“This unprecedented fine is indicative of the magnitude of the transgression and the seriousness with which the NCC and the authorities are approaching this issue. It is also more likely to ensure that the wilful noncompliance by MTN ceases.”

The document is furthermore said to accuse MTN of repeated violations. “MTN’s noncompliance with the deactivation directive is unfortunately not an isolated incident. It needs to be seen in the context of a general pattern of noncompliance with regulatory directives…”

MTN’s troubles in Nigeria come as it seeks to have its operating licence renewed. The licence expires next year.

In South Africa, meanwhile, where MTN is listed, it is facing a potential probe by the JSE over the timing of its disclosure to shareholders of the Nigerian fine.

The JSE is engaged in “focused conversation” with Deutsche Securities, MTN’s sponsor, in the interests of the operator’s shareholders, GM for issuer regulation Andre Visser said on Tuesday.

Despite news of the fine being in the market in the early hours of Monday morning, MTN failed to notify shareholders about it until 2.24pm.

It’s not yet clear whether the JSE will launch a formal investigation into the matter.

MTN’s share price has taken a beating over the NCC fine. It collapsed by 12,5% on Monday, wiping R44bn of its market capitalisation. Shortly before 3pm on Tuesday, the counter had shed another 4,8%.