If your wife owns a property maybe she can get the village head man to vouch for you to open an account. That's what I did. I also have a Thai phone number.
I agree with some of the comments with regards to individuL immigration officers however I was told the maximum was two times then you had to return to the country of origin. Of course being Thailand that rule may have changed.
Its getting harder for farange to get a bank in Thailand. I got a bank account in Pattaya okay before the rule change however in AmnatCharoen I had to get a head man my partner new to vouch for me.
I meant to add; you can get 60 days + 30 day extension. I have a place in Thailand with my partner but currently living in Perth. That's my plan when I return to Thailand. Remember the one also needs TBH