for your information only, vitz with CVT don't need to have the oil changed (atleast before 100,000 km) and if you desire, use only ATF-WS and nothing other than that. I don't know if ATFWS is available here in Pakistan, but after a lot of research and talking to goras, one in Toyota dealership, head of technical department, whom I know through a forum.. he said that these transmissions don't need to have the oil changed, however, if there is a problem or UPON first inspection which is at about 100,000 kilometers something is fishy, they change it. Otherwise there is no need to change nor you can put in any other ATF than ATF WS. Good luck.
And the new vitz with CVT doesn't have a dipstick, it has a nut on top to fill and one on the bottom to drain, you just fill it till the upper nut (which is essentially at the left side of the trans) and let it go.
What year VITZ you've got exactly?