Hi Mr. Benjamin,
Email to the HDB branch in charge of your flat (use the below link)
http://www.hdb.gov.sg/cs/infoweb/contact-us
Explain, attached with photos request their assistance to assess the problem.
They will liaise with your neighbour above you to assess what is real cause.
Check with them whether can apply for subsidize rate to repair this. If it is subisdized, it should be around $600 for one toilet, split equally between your neighbour and yourself.
The most important thing is try to speak to your neighbour nicely regarding this, so as to speed thing up. It is not their intention to cause this problem either, thus don't blame them for causing this if it is their water proofing problem.
Hope you can get your problem solved fast.
Best regards
Ling CK
90110636
ling.ck7@gmail.com
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very knowledgeable ..
hope goes well at yew tee