LG Aircondtioner poor qualilty compressor covers

We installed 4 x LG Artcool Air-conditioners of various sizes from 9000 to 24000 BTU. The compressors have a 5 year warranty. After 1.5 years the covers were showing signs of rust, and after 3 years, all the covers of the compressors were rusted beyond acceptable norms, to the extent of defacing the look of the property. Air conditioner compressors of other suppliers that have been installed in the immediate vicinity do not have this problem. I reported this issue in detail to the installer with pictures, who forwarded it to LG. LG's representative "Carol" wrote back a one liner "Unfortunately the covers are not under Warranty". The solution offered was to replace the covers at R5500 per cover. As it seems that LG is happy with this standard of product for an outdoor unit that is not treated with an appropriate paint or cover that can last longer for 3 years, I highly suggest you look at alternative vendors such as Samsung, Nashua, Alliance and Luxaire, that do not seem to have this problem of excessive rusting over a short period of time.