Spokesman Marius Croucamp said wage talks between the two parties had deadlocked.
“Solidarity is demanding a wage increase of 8.8 percent based on the consumer price index of 5.8 percent plus three percent.”
He said wage talks began in March and after five sessions of negotiations the parties reached a stalemate.
“Trade unions rejected Telkom’s final offer of a 1.5 percent increase.”
Comment from Telkom could not immediately be obtained.
Croucamp said the union was still in talks with the telecommunications company over the severance and early retirement packages it offered to 21,000 of its employees earlier this year.