where is your customer service/responsibility?

Dear Samsung SA

I would like to state that your customer service to me has been absolutely shocking. Please can someone explain to me how Samsung does not take ownership or responsibility for a brand new s9+ being a completely dud phone. The screen has dead spots and then to add to it has a massive lag where there are no dead spots. I have taken this 2 week old phone to Samsung and somehow this has become my problem to fix - THE PHONE IS BRAND NEW! Why do i now have to be without a handset for 3 odd days because you clearly provided a dud phone. If this device was a year or so older i would understand that it should be my responsibility however i cannot fathom the customer service i have received on a phone that is 2 weeks old. Who is going to cover the cost of my screen protector and other purchases that have now been removed off my new phone in order to test and for Samsung to prove that this fault is infact their defect. why is it my responsibility to be driving from pillar to post to get this fixed and sorted out on a brand new device? How is this customer service?