I have been a subscriber for years, since before they started charging.
You pay 300 only on the first time to set up the account and the first month's charge Thereafter pay monthly, quarterly or annually.
Say you are paying monthly and want to pause for a while, simply do not pay the next month and resume when you return. Simply resume paying -- service resumed within minutes, no need to pay the 300 Baht again.
My BIG problem is that I bought a new phone but they do not yet have a player for Android 14!