my immigration office wanted copies of every page in my old passport containing a stamp when I went for my 12 month extension, I'd already had everything moved to my new passport about 3 months prior...
your account is probably being investigated as a mule account in that case. Quite distinct from dtv accounts being frozen. It will likely take as long as it takes, particularly if the bank person you paid is under suspicion of opening many accounts this way.
In theory its possible but not straightforward so you might find it simpler to just do a border bounce. I'm not sure about Samut Prakan specifically but generally immigration offices want to see all of your information updated to the present time and 500k baht in your bank for the last 30 days.
stay at a hotel, ask them for a copy of the TM30 receipt and take it with you to the immigration office that serves that area and file your 90 day report
Anonymous participant if you apply using soft power they do like to see how you support yourself so the annuity would be useful for that. But it won't help you get a DTV based on remote work