@Joel ******
keep trying, ask to speak to the manager, even to arrange an appointment on another day. You could say I am looking to build a long term relationship with the your bank to make the appointment. No point in dealing with gatekeepers, the source always.
Firstly you have to dress well, each bank it’s discretionary so if you are dressed like a typical backpacker or singlet shirts & flip flops, you are just not going to be taken seriously.
Ensure you have a Thai mob registered to your address in Thailand, not a hotel or box no.
Ask to open the basic savings account which will come with an atm/debit card, you can get mobile banking as long as you have a registered Thai mob.
Depends whether you really need a bank account, if it’s only to use for a few transactions every month then not worth it.
If you get an appointment with a manager, explain your background what you want to achieve having an account with the bank. You could say I am planning to deposit 500k + THB with you and I am planning to apply for a DTV and after that, I plan to set up a business with Thai partners and get a work permit obviously using the correct visa etc. So you are looking to establish relationships and build over time.
See how that goes, or any other approach you may come up with but at all times, be incredibly respectful to bank staff etc and never lose your cool.
Try a main bank in central Bangkok like K Bank, SCB etc. you may have to try at several branches or banks if you can’t make progress.
Thailand is fluid, maybe the laws will change, be more relaxed but for now devote the time to try and make a success of it. Some won’t bother or just give up, which will tell you you won’t survive in Thailand GL
Please post if you successfully open an account but you don’t have to name the branch, that wouldn’t look cool at all. Just which Bank and if it was in Bangkok or elsewhere?