Ah Chirone calm down dude. Dont forget people from other places hear things differently

There are various twangs in the 3 accents that do make them quite hard to differentiate from one another at times, Ive had the experience of all 3 and to me the hardest one to get is the Southern african one as its quite gutteral and depending on the area they are from, its also very broad.

Though a close buddy of mine is from SA yet his accent is very slight and is almost Australian, but what you have described with the word 'Six' reminds me of friends Girlfriend from NZ, she sounded like she was saying 'sex' and also when she said 'cat' it sounded like 'cit' as in 'kit', shes from Christchurch.

Anyway Im no expert but I guess its how things are heard to the individual, so take take it as a personal shoot at Kiwi's

cheers
Jay