So basically, "Void without prejudice" means they cancelled for no specific reason or they cancelled the visa for so many reasons, they can't be bothered to explain them all?
Or is it Void without pointing fingers at the applicant?
I suppose. When Visa application got denied in the past, they just handed back your passport and the application with Visa Denied on it, nothing in the Passport. You just lost your fee, that's all. So one just went to an other Consulate or Embassy to try their luck or entered on VE and mostly it worked.
But having an actual Visa Refused stamp in your passport will probably not allow you that anymore,
I was refused entry for being a Hippy, not having sufficient funds, not wearing an appropriate shirt or being barefoot and always managed to soort it out at the same day, maybe a few hours later but at the same day ;-)
I usually make my border run to Wang Prajan (Satun) but never, ever paid a single satang or ringgit. Not on the Thai Side, not on the Malaysian side, although might be different for "locals". So an update would be much apreciated, thanks.