I haven't read all the comments so might be repeating something already said.
Sounds like they are only closing your credit card down. Presumably you will continue to have a current account with the bank. My Halifax credit card is used for buying flights etc and it is useful to use it in order to pay with uk funds while in Thailand. I have just made plan B and git a Currensea card that you can use abroad. It is connected directly to my uk account and debits all payments from it. I have not had the opportunity to use it yet but it might be a solution to your issue.
I got the card in the UK so I am uncertain whether you can apply from Thailand and get it sent to you there.
I have transfered successfully from Bangkok Bank to uk using the banking app or you could go on line. It was quite cheap to do but not all banks charge the same.
Dee Money is also an option and appears to have overcome the problems they were having a few months ago but I haven't tried them since.
You can send money back to uk from your Wise account but not from a Thai bank account through them.