Samsung s7 edge screen

Good day.I am not happy at all with the service that i receive from samsung at all.I have a samsung s7 edge and the problem started 3 months ago where i had a line on the right hand screen.So i went to samsung tygervalley and spoke to Alfred.I asked him about the line on the phone and he said to me that i will have to for a screen replacement.I also have proof that he looked at the phone and gave me in writing his name,date and signed togeteger with his hand writing that it would be done under warrantee.I then phoned samsung voice and they said they wil get back to me and that there turnaround time is 48 hrs and i am still waiting.I dont think anyone would appreciate service like that from them and i am very dissapointed. Regards