I had a tele-conversation as well as email the document to the Thai Embassy in Singapore, however, they have yet to come back to me with the acknowledgement.
As for the request of an acknowledgement stamp from the Notary Public of Singapore, I am still in the progress of finding the correct person there to assist me with this.
Please let me know if you are able to assist me with this from your end.
For now, these are the updates which I can provide you with. Shall keep you informed for the progress