when will they pay?

On 19 August 2015 my wife Vanita did a shoot for Merchants Corporate through her agency Chameleon Casting. The staff told her she will be paid latest after three months but it is almost seven months gone and there is no sign of payment. I called the office on numerous occasions but was told only Johnathan could authorise payment but he was \never in\". I sent him four emails with my query but he did not afford me the courtesy of a reply I do not what else to do besides go the legal way."