This router is definitely not from the official Aztech Singapore which is now into home consumer electrical products more than networking today. Their routers suck too anyway back in the DSL days when their WebGUI firmwares would often get stucked and bricked easily when tinkering with their settings and commit ROM writes.

This DS244WSGV is a cheap unbranded OEM model sourced from China which goes under many different brands around the world. China has been known to hide behind different country source when pushing their products to markets as recently Japan has found out that their face masks supply was not as claimed to be Taiwanese but was actually made in China sold to them under a Taiwanese proxy.

Same goes for this router, besides A-Z Technology, it is also sold under some other Taiwanese company proxy known as ATW Technology, Inc. (Loopcomm) with a Taiwanese address.
http://www.atw.com.tw/product/product-detail.php

The very same model of the router is also sold under another China brand named Comnect with the same model number DS244WSGV on Alibaba.

TM is probably getting this router below RM50 in bulk as I've also sources that Huawei GPON fibre modems(ONT) can be acquired below RM40 in small bulk sizes of 40-50units today.