I suspect that the agent who is a relative is trying his best, but probably does not realise that QMAS is not guaranteed at all and does not like to tell his relative that.
To the OP - pls do not come to HK until you get confirmation that your QMAS visa has been approved. Only a small percentage are approved and most of those who are turned down come from the Indian sub-continent (mainly because agents scam people who have no chance of being approved into applying, hence the skeptics here).
However, if your post is anything to go by, your English is not good enough to gain the points for QMAS, nor to get a job in a bank. If you are applying for HSBC Premier and such like, you need to speak excellent English, pretty much natively. You will be competing with high class candidates from the UK and other places and so without any Cantonese or Mandarin, you can only go for these jobs for which there will be significant competition.
In terms of call centres and the like, many HK companies outsource these to the Philippines as this is MUCH cheaper than having staff in HK undertake this role. And Filipinos speak excellent English.
So, your plan is looking a little shaky. See if you get your visa first. Then you can plan a trip here to suss out the opportunities. At worst it'll be a fun holiday.