James, please read my post:
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Those retail ISPs are hit an miss....
I would just check that you router is not actually causing the problems.
Define adecuate...
I never use retail services internationally...
If you are with Netvigator PPPoE service what you can do is call non retail ISPs Netfront, Pacnet, OneBB etc... and ask them to let you login to their network and try it. However you are looking to pay at least HK$800 upwards... Don't get hung up by the sepped. a 4M from a corporate player will give you consitent performance... I recently got a 100Mbit GEPON line with Wharf for not a lot, not sure if it was 4K or 700. And get 25-60Mbit internationally out of it... WIthin HK about 70Mbit... They probably won't have coverage for retail.
I would try their 10Mbit LRE (Long Reach Ethernet), basically 2 wires to a switch in your building and then out over fiber to their local backbone.
FOr low cost I would try Netfront and ONeBB. Not th best throughputs but always works if you are buffering anything you have ap roblem.
IN my work, I use all: Whart, HGC, Verizon, WharfT&T, Netfront and Diyixian. Each one has their benefits.
For the professional you rbought on site, did the guy bring a Cisco (not Linksys) with him as using a PC is useless to do diagnostics.