Cape Town - Communication Workers' Union members at Sentech have gone on strike over benefits and wage increases, CWU general secretary Thabo Mogalane said on Wednesday.

The union declared a dispute and began their strike this week, affecting operations in Johannesburg, Durban and Cape Town, he said.

Union members were demanding a 10 percent wage increase for the lowest paid, nine percent for middle-income earners and a seven-percent increase for the highest-paid staff.

They also wanted a guaranteed 13th cheque in the current financial year.

Alternatively, members would settle for a 10 percent increase and a 13th cheque in a 2015/16 agreement.

Other demands were a housing allowance of R1450 and a moratorium on retrenchments during the wage agreement period. - Sapa