i think you are in the same predicament i was in...
i had opted to pay by bpay/postpay and it opened the pdf.. then my mother gave me her credit card so i closed the pdf and attempted to go backa few steps and opt to pay by credit card instead,, but icouldnt go back to teh payment section and it just went through as if i had paid..
[this also happened to my friend..]
so i contacted UAI [on the website: 'contact UAC'] as an applicant and told them the situation
they contacted me straight away saying that they'd send methe details within 2dyas..
and eventualy they just sent me the PDF file and i bpayed it..
and then 2days later? i get a letter from them saying i'm yet to pay..
but i attribute that to the delay of the system registering that i'd paid... and prematurely sending out the letter...
well i hope so anywayw...
:S!
they