Do South African passport holders with a Non-O multiple entry marriage visa need proof of funds for border runs to Malaysia?

Beware South African passport holders: Looking for some clarity. I have a non o multiple entry marriage visa obtained in Savannakhet. After my first 90 days i got a 60 day extension to visit my wife from my local immigration office in Hua Hin without a problem. I normally used to go to Ban Phu Nam Ron *border* crossing Kanchanaburi but Myanmar has stopped accepting passports from South Africa for some unknown reason .

So i had to make a different choice as far as border runs are concerned . I did my first Malaysia border run to Padang Besar which was supposed to be the better border but seems that the days of doing the 90 day out in out in is also now becoming a bit of a problem. The immigration guy told me in quite a rude manner that i need a 20000 Baht statement from the bank or show them that the funds are available via my internet banking. After a bit of talking to the guy he demanded i phone my wife so that he could talk to her and tell her that he will let it pass this time but there won't be a next time without proof of funds .

I was under the impression that if i had this type of visa that i did not need proof of funds. The reason i chose Malaysia was that it was convenient as i live close to Hua Hin and not only because it was the cheapest option but also not having to stay overnight in Bangkok if i had to choose Cambodia . ( Hua Hin to Malaysia and back 1800 Baht which includes return train tickets to Hat Yai , scooter taxis and mini busses ) compared to 3000 Baht for a Cambodia border run excluding getting to Bangkok and back plus a overnight stay in Bangkok.

They have a official notice on their wall stating that Tourist and Immigrant visas ( Not stating what kind of Immigrant Visas ) need proof of 20000 Baht. Anybody have a idea if this is the case.