Bad service

Hi samsung this is directed to your approved repair agents unitronics in cape town century city . First of all im happy with all my samsung products . Ive got a s7 that delaminated on the front screen and the rear screen has to be replaced all good till i went to untronics ... first of all you wait for ever in a que while the consultants talk amoungst themselves about the weekend etc when you finally get your phone booked in they tell you 3/5 days well 4 months down the line they say there still no spares available... no one phones you or emails you . When you phone them (when someone decides to answer the phone ) they just say no spares and someone will phone me back and let me know . Now if a warranty cant be honoured then the phone should get replaced ? Your urgent response is appreciated Nico