bad service and false advertising

I go to TTS in pe to repair my phone screen. There is a poster saying samsumg galaxy phones first screen and LCD replacement free. But when you ask you get told its only certain models. Your repair agent cant keep spares and you have to pay before they well work on the phone. Ive paid was told 2-3days. Its day 4 ive called them but they cant tell me the statues of the phone. Ive never come across a service center that cant afford to keep spares that are suppose to be free. All my appliances are Samsung and I dont want to have to use your service centre again. So maybe its time to start using a new brand