I'm not sure how it all works, but "re-financing" did seem to mean something like this [this is not necessarily the only meaning, but that's what people did]
You buy a house for R100k, with a loan of R100k paid off over 20 years.
Now your house generally becomes more valuable, so after 5 years say it's worth R150k.
Then some people fell into this trap and "re-financed" their loan to R150k .I'm not sure about the monthly installment, but now they basically "give" you that extra R50k to use. Alot of people took the R50k and bought a car or something useless with it, instead of actually paying off the loan.
In the end, people do it every year and every year their house would increase say R20k or something, and then they start "living" on that re-financing thing. So their loan just grows and grows [with the value of the house of course]. So in the end you make debt based on the growth of your house.
And then suddenly your house value drops or do not change or you try to sell and you can't sell it for the "re-financed" price. This is where i think alot of people is folding. Now you got to pay off a R500k home, which is effectively worth R400k and the other R100k you're paying off a car or some side investment under the guise of "re-financing". So you took the "profit" you "might have received" if you sold your house in a given year and expanded your loan so you can use the money without actually selling the house.
Obviously if they say your premium will be LOWER after re-financing, i dunno what they actually DO to your loan though ??????
Either way, i'd watch out for this thing in the current market. It's this type of "trick" that got alot of people into trouble when rates changed and markets slowed down.