Screen replacement

I took my samsung s4 in to have the screen replaced on Monday 14/09/2015 and I was promised that it would be done by Wednesday 16/09/2015. I went back to the store on Wednesday 16/09/2015 an I was told that they are still waiting on the LCD an I was very disappointed that it was promised to be done on that specific day. After waiting nearly a week I received the phone on Tuesday 22/09/2015. But then the phone only worked for an hour so the touch pad was not working anymore an the phone was useless . I then went back to the store on Thursday 24/09/2015 the tech isn had a look at my phone and told me that the screen had to be replaced again because he could not the touch pad to work and then I was told that there was no stock of the screen I need and that I have to come back on Monday 28/09/2015. I'm very disappointed with the quality of the screen that was put in my phone an that it took samsung nearly a week to get stock to the branch where my screen was being replaced after I was promised my phone by Wednesday 16/09/2015. I really need to use this phone an cannot wait another week for my screen to be replaced.