Once again bad service from Samsung

What is the point of the ADH warranty? That's what I'm asking myself at this minute. My screen broke on my s4 on Tuesday - I'm out of warranty on that phone however I bought a brand new s5 from Game and activated the warranty on that in May 2015. That ADH warranty advised me that the warranty was transferable to whichever Samsung device I had - ie either the s4 or the s5. Today I'm attempting to get my screen and lens repaired through smartlab only to be told by smart lab \sorry no - we cannot help you - your s5 cash slip from Game does not reflect the IMEI number "(eventhough I have the original box with the IMEI number on it) and secondly"