Mochachos uses Genetically Modified chicken

Terrible service from the New Redruth branch. I ordered a full chiken and got 3 tail pieces. My question is what sort of GM chickens are Mochachos using? I contacted Renisha (Manager) on 26/06/19 and she promised to investigate and revert to me within 24 hours. Whenever I call for her she is not on duty. For being a loyal supporter of Mochachos and spending over R300 on that meal alone I demand an explanation.