streamyx 1mb to 2mb upgrade, I want to upgrade my steamyx

I checked with my ISP here. They say can upgrade to 2mb (since Unifi and others not available for our apartment...)
I wanna ask, if i am 1mb user and want to change to 2mb user. do i need the TM guy come and fix another new line at my house? i heard some of my friend say they just give us 2mb account and dun need to worry about the area dun have support or un-available...
I am confused with the stupid Shitmyx customer care... call 100 say can support... go to tm register say not available... ask tm technician say no port already... 3 different stupid answer...