Slow service

I grew up admiring Game store, when I started working I bought a lot of things from Game,in 2015 I bought an LG home theater systems at Game since I'm changing places to stay a lot I lost the slip for my sound system. On the 24/02/2018 I went to Game to ask for a slip reprint and I met a floor manager Kevin Moodly from Game at West street in Durban where I bought the system, he told me to get a serial number for the Radio and I did get the serial number he said it takes about 3 day's to reprint it, I went on the fourth day to look for the slip but I was told nothing came yet. I went back again on the o3/03/2018 again they told me they haven't received it. Today I went again to check and they told me the same thing and now it's been 8 day's but I was told it only takes 3 day's so I feel that someone is not doing their job. I am disappointed from the service I received from my favourite Shop