I just wanted to advise anyone who is having issues with their MacBook keyboard that you are entitled to a refund or replacement under the Australian Consumer Laws for a reasonable period of time after purchase. You can either argue it's a design fault or major fault. Both Apple and JBHIFI have accepted the keyboard issue entitles consumers to a refund or replacement. All it took was an email to JBHIFI explaining the situation.
While there is the keyboard replacement program, I decided to take this approach as I had the 2016 model, and the newer 2018 and 2019 models are 'supposed' to fix the issues with the plastic membrane.