The Trade Union Congress of Namibia (TUCNA) has also called on MTC Namibia to give permanent employment to those who have been working on contract for years at the call centres.

The union says it has received several complaints from MTC's contract workers at the call centre.

Some employees have allegedly been on contract for more than five years.

This, TUCNA president Mahongora Kavihuha says, contravenes the provisions of the Labour Act.

"They must remove the threats and the pressure that they are putting on their employees to join the trade union. They must, with immediate effect, give a permanent contract to these employees."

In response, MTC's Chief Human Capital and Corporate Affairs Officer, Tim Ekandjo, says the corporation is unaware of the complaints.

He further says that MTC does not have trade unions, and they cannot respond to the call via the media.