ok lets make it clear...

1 - I do not think urs leaking is roof leaking... is more into the Windscreen leaking...
2 - Y??? i say that coz if roof leaking ur whole car top interior will have water mark... and now it is only the carpet that is wet... BTW water will not flow to ur pillars from the roof only the windsreen part... so it is more onto windscreen problem..

send email to toyota HQ or go there and shout!!! i f*** their SC ppl b4 i don care but i wan what i should get...
Toyota, Telekom, Big Famous Restaurant... i shout there b4... is not that u shout means that you are not civilize but it is ur frustration...

Hope they will fix ur problem...

actualyl very easy ask them to take the windscreen off and replace the rubbers and glue for it... done... my fren have this problem with perodua also but then problem is the gluing problem more to labour cause...

ask them to do it la... if not wack them hard... where is the leakage point ask them and show it to u... use water hose to show the car top then see where is the leaking point...
if everything u depend on them, u will not solve it fast...
i say that from my experience with mechanics, they taught me that...