What challenges might I face when extending a DTV visa in Bangkok?

Absolute nightmare trying to extend DTV in Bangkok

Workaction category (I have a software company and I work for myself. - have clients in UK) self employed

Documents

-TM 7 + photo / Passport + copies

- Personal Bank Account statement (£40k+)

- Business Bank Account statement (£25k+)

- Business incorporation document

- CV / Portfolio print out / Letter from current client

- Rental Contract / TM30 / 90 day report

First the officer looked at the Passport and then Personal bank account. Did some currency conversion

Said he didn’t need the Business bank account statement because I have a lot already?

He was then confused about my business incorporation document. So he had to consult his Boss.

Then they started asking the silliest questions about my clients letter. And why it didn’t look like an official letter and if they could see the official business incorporation document (maybe one with a wax seal. Like in the movies)

I tried to tell them they can check UK official companies house website to check my company’s legitimacy

Then I tried to show them my clients payment into my business bank account

I explained I already got the visa with the same documents. Then they wanted me to print the client letter I submitted for my initial application (which I showed them. It’s identical with a different date)

Then they finally decided to accept. But said it will take 15 days as they need to consider it.

I started getting a bad feeling about this. Because if they’re so confused with me present - trying to explain. They’re gonna be more confused behind my back.

I told them 15 days was too long and I had to leave the country before then.

The officer was confused and said I didn’t need an extension then because this is a multiple entry visa. And I should come back after my next 180 days are up. He said I need to bring more evidence of clients next time ? And he tried to keep my TM7. But I told him na. And bounced