Tried all that. Residence cert, copy of my condo lease, big stack of thai baht. All did not matter because I had a tourist visa and there regs are no new accounts with tourist visa.
I hit 11 bank branches in Phuket over the past 12 days. Bangkok Bank, SCB and Kasikorn. All said no when I showed them my passport and METV.
At one Bangkok branch in Kathu I was shown a memo that said due to changes in regulations the bank will no longer open accounts for holders of Tourist visas. The paper was dated April of this year.
That was years ago. Not saying they don't "have ways" of getting it done but things changed drastically this year. And I had a residency certificate from immigration.