Poor Service

I have a Samsung S5 that is just over a year old and the cover that protects the charging port from water and dust has already fallen off. The water and dust protection was one of the reasons that I purchased the Samsung S5. I have searched the web and seen that this is a fairly common occurrence and easily fixed in store. I went to the Sandton Samsung experience store today to have the cover replaced. The gentleman who helped me at the service center said it would take 4 hours to have the cover replaced. I find this unacceptable firstly because I need my phone because of my work and secondly because I know that the fix at most will take 10 minutes. The service representative was not willing to help. I find this highly unacceptable because the cover should not have fallen off in the first place, especially a top tier mobile phone product from Samsung, and the repair should be a quick fix.