Not that hard mate, the immigration officer does not have all the information you presented in order to get the visa, believe it or not many people fa ke details such as bank records, even put thier names on births certificates for kids that aren't theirs, it's crazy what people will do to secure a visa, it's the immigration officers job to scrutinize everything otherwise what are they there for?
Anonymous participant 237 put it this way so you can understand. If you can't re-enter on an ed visa then what do you have? Do you have a valid visa? No, if so what do you cancel? You can't can't cancel nothing cause you've got nothing to cancel.
Anonymous participant 237 Tod is correct, if you're on an extension of stay and you leave without a re-entry permit as soon as you leave it's no longer valid, nothing to cancel.
You are starting a business so you'll need a thai person to do that anyway, deposit into thier account to open the business, after opening the biz then they can open the biz bank account, don't know your biz but if you intend do anything online setting up stripe paypal etc at lot easier for the Thai national to do anyway