The Freeport has not yet paid workers who had been suspended although it had promised to do so at a meeting before Social Policy Minister John Dalli on April 21, the union said.
The meeting had been held at the height of the dispute over union recognition.
The GWU had issued a go slow directive at the Freeport and the company by successfully requesting a garnishee order to freeze the union's assets.
The GWU said this evening that when it and the Freeport agreed to withdraw actions against each other, the Freeport had also agreed to pay three workers the money they had lost while they had been suspended because they had obeyed the union's directives.
The union said it was being very cautious on the matter so as not to be accused of creating trouble. But the managing director was not keeping his word and this was not acceptable. The GWU said it had informed Mr Dalli of the situation and he had confirmed that such agreement had been reached and promised to intervene for the situation to be resolved.