Summary:
May 20 (Tues)
- Car sent to CoSE at 8.20am, called in evening (picked up after several calls to the SA direct line), told me workshop still finding the leakage point, takes time as they need to dismantle the seats & carpets.
- Also told me that they will focus to fix the water leaking issue first before looking at the missing 'O'.
- Promised to call back but never did.

May 21 (Wed)
- Still no call from SA, so I tried to call him several times again.
- Finally got him in the evening, he told me leakage point is found but it's at front side, so they need to dismantle the dashboard in order to access the leakage point and re-seal the leakage point.
- And they only assign one mechanic per car thus he could not advise when can I get my car back.
- Also all replacement cars (RC) already given to other customers, so they cannot get a RC for me as well.

May 22 (Thurs)
- I was busy with works, did not call them. And he did not call me also.

May 23 (Fri)
- I called him at 8.10am, managed to get him during second attempt.
- Leakage is re-seal, in process of installing back the dashboard.
- Promised to call me back if there's any update.
- When asked about the missing 'O', he's not able to answer me.

I think most probably my car will not be ready today since it's Friday with long lunch break+prayer, so with this lemon car, I have no car to be used for 5 days already...    

You can say that I feel regretted for getting SS already....