I have no experience with things like this, from what I read from your account seems like Spectraa Production is just making things difficult for you so wishing you all the best!
Besides you other actions, add in social media action publicity. It could possibly do more damage than the invoice you have in mind.
Story on FB and some of the SG forums. Paste the email exchanges there for public witness. Not a lot of people visit clubsnap. Mention Mediacorp too - part of the facts and put them under public scrunity as well. By right they should be the ones handling this.
If your work is good enough for them to swipe, it could mean you have a good future career in this. In that case you'll run into more of these issues eventually - might as well start learning to deal with them early.
Thanks for all the encouraging words. Sorry, my bad for not posting where the clips were at. There were three, the 5th minute mark, 11th minute, and 18th minute. Basically 6 seconds of 3 different scenes. I will need to watch the episodes after 38 to see whether they used any more of it.
I am collating everything together and doing a fb post as suggested by some here. Spectraa's fb page is not even active anymore, so I shall forgo pming them. I will definitely tag Mediacorp in it; thanks Zaren for the idea.
Sorry, I'm not born business minded so I might have pissed some of you off with my approach to handling this issue, but thanks for the continuous suggestions.
I also have to publicly thank one of the users in CS (not in this thread) who pmed me offering me financial help. He/she talked to me about his past experiences. Of course, I declined politely as I'd rather handle this issue myself (since technically I was the one who caused it). Nevertheless, it was a very touching gesture to me. Thanks ****te, appreciate it deeply.
TS I hope this gets resolved in your favour. I dunno how you feel about this now but as JasonB mentioned, push it through to the very end. Get what is rightfully yours and don't give any quarter especially if they are going to make you jump through hoops.