Telkom said that a union-led strike outside its Centurion offices in Gauteng turned ugly on Monday with employees being “aggressively intimidated” and “threatened with violence”.

Jacqui O’Sullivan, Telkom communication and PR executive, said that the Communication Workers Union (CWU) chose to turn a protected strike into an illegal blockade of Telkom campuses and some yards.

“We are currently working with the SAPS (South African Police Service) to secure access to Telkom Park. Our staff have been aggressively intimidated," O'Sullivan told Fin24.

“CWU members have not allowed staff to enter the campus and some yards. They have physically shoved our people and have threatened them with violence," O'Sullivan said.

“I was personally a recipient of this attempt at intimidation,” she said.

CWU said it launched a ‘fully-blown’ nationwide strike against Telkom last Thursday. The union said that almost 4 000 of its members joined the strike.

However, Telkom has disputed this figure saying that only 100 striking workers were outside the Telkom Campus in Centurion on Monday. Meanwhile, on Friday, 453 people were on strike across the country, according to Telkom.

CWU president Clyde Mervin said he was not aware of any cases of intimidation.

“We are in the midst of a total shutdown with Telkom. We will also march to the various stakeholders and leadership of Telkom,” Mervin told Fin24.

The dispute between Telkom and the union stems from a failure between both parties to reach an agreement this year over a 'Performance Pays' incentive and annual salary increases.

Telkom inked an agreement with SACU (South African Communications Union) and Solidarity in the first week of June 2016 that promised no new forced retrenchments over a two year period.

The deal further included that 2016 bonuses would be paid out in full and that workers would receive a guaranteed increase of 6% on their salaries on April  1, 2017.

“The CWU leadership told Telkom’s leadership that they would be signing the agreement, pending the resolution of one 'legacy' issue," O'Sullivan told Fin24.

"In fact on the day, Clyde Mervin the President of the CWU and I both did a radio interview in which he spoke first where he confirmed that they were looking to signing the agreement, pending the resolution of that one issue,” O’Sullivan said.