Hey Deba_Avik,
As promised before, I am sharing the latest news about my COC letter from Singapore.
As you may recall my apeal letter for issuance of COC, Singapore Police Force informed me that my apeal has been accepted and I went to apply for the COC letter yesterday.
Also, the VISA office answered my Email and sent me a request letter containing my name requesting the Singapore Police Force to issue the COC for me ( the letter came late, because I have applied already without the letter).
So, you may have two choices:
1- For saving time, you can make an appeal in Singapore Police Force for the COC. ( This itself will take 10 working days). If got accepted, then go for application of COC which this will take 10 workiing days as well. In total, 20 working days.
2- When you receive a update email about the COC from VISA, imediately reply their email asking them the request letter, because it may take long time to reply your email ( for me 2 weeks).
Hope it helps, and best of luck for you.
Rgds,
Tracy