No commitment to service delivery

I have been trying for nearly 2 months to get a 10 amp plug fuse for my car battery charger and spoken to at least 4 different sales assistants there. The first time I went there I took the battery charger that wasn't working with and the guy didn't even know to check if the fuse was blown. When I figured it out myself I went back to get the fuse but they don't have the 10 amp rating available. I was told that it would be ordered but so far I've been back there every week with no luck and then the next guy just promises that he will order it for me. Over the years I've supported them many times and spent quite a lot of money there but it seems the fuse is too cheap to make an effort to get for me.