It seems like another thai exchange still in business is
https://coins.co.th/Does anybody know if it is reliable?
From what it looks like they are run by the same company as coins.ph they do have the same logo and trademark at all. But the thing is the local operations of Coins here in the Philippines has been recently bought by GoJek so the Thailand operations might be handled by a different company now. Still if they were once handled by one company then I'm confident to tell you that their 3rd party wallet app is good but I cannot say the same thing for there crypto exchange that offers up a few coins, it might be different in your country but you might as well check.