Are you trying to say you signed up for the card without even understanding the product first ? That's rather unwise isn't it ?
And you come here to ask us to research for you after you signed up for the card ?

Pls do not simply apply the cc which u do not know....

Since you insist for an advise ... here it is.

There has never been a mention of any prerequisite for a loan application to be credit card application. Please read your application form and I challenge you to look for that clause that require you to sign up for additional products as the approval condition.
It's always the case of the irresponsible agent trying to meet their cc and personal loan quota (They often carry this together) by "bundling" the both and "conning" the unsuspecting consumer into believing this is necessary. Bro @Titan_Gunners is right in saying ... you have the right to reject + likely you are unwise in signing up for something which you don't understand.

1. Cancel that card and pay up the GST. Consider you are paying the price for your mistake.
2. Don't be misled just because anyone offer you any form of loan.
3. Next time, don't sign up for any financial products you don't understand.
4. Do your homework before coming here and asking people to spoon fed and rescue you.

An HSBC card agent (Works for the HSBC bank and not a 3rd party marketing entity) that approached me admit this to me. They tried the same trick but I counter them with the correct fact which they shyly admits it because I verbally mentioned that I don't subscribe to lying agents. (And there were a lot of people around at that time)

You are not the first one with such questions. Everyone has an intention for such high CL - whatever it is.

CL commensurate with your income and we over here provide responsible answers. You want card with 30k-50k then submit your application to the bank with appropriate supporting documents or find a bank that accept FD pledge of RM30K-50K and you'll get such CL. (Probably)

If you want us to tell you how to get CL with 30k-50k but you only want to produce income document of RM3.5K monthly then this is not the place.