I missed the memo but on November 22 public was warned to reject calls with +698 (Thai Sim card from outside country) or +697 (internet call) from unknown persons as likely call center scam calls.  (Thai networks add the 3 digit to front of numbers to alert customers).

 

Got one today - recorded Thai message that need to contract bank (which not where have accounts).  Just hung up and then checked number and at last got the message.

 

https://www.nationthailand.com/thailand/40021975

Best is to just don't answer those type of calls, or reject them, no one has any need to answer calls from unknown "international" numbers.