Bring the docs you applied with, you'll be asked general questions on your job, reasons for the DTV etc. You will need to show your current bank balance on your phone. It is an easy process and as the threads show, overwhelming majority are approved shortly after.
Anonymous participant i have heard of people using them for visa runs. ED visa but not the DTV but they are reputab;le. 75k THB excluding embassy fee?? you have you own business so it easy to do yourself i think. unless you uncomfortable with paperwork.
Anonymous participant You can explain the address change, could ask the bank to state your address change in a letter. Are you a resident/citizen of Singapore?