Update:
I drove myself to the satun border and the officer told me if I stay two days in Malaysia it’s ok but if I want to walk out and walk back in I must pay the border fee of 2k, so I did.
No problems, no questions.
Agent wanted me to pay 3k if I drive there myself and 4.8k if they take me.
No agent needed.
Hey, has anyone done a land crossing border bounce without using an agent? Preferably at satun border.