This is their reply:
"Dikhololo is upgrading the Studio units and making them into a 1 bedroom unit, still sleeping 4 people, where the loft is now being closed up into a private bedroom.
Dikhololo will also be looking at making 2 studio units into 2 bedroom or 3 bedroom units and this is because of keeping up with the demand where families are requesting bigger units at Dikhololo and we all aware the current status is that there are too many Studio units which turn people away from booking which results in a loss in income whether in rentals, levy or even exchanges.
You will now be the new owner of unit XXXXX which has already been refurbished and made into a 1 bedroom unit, without any transfer fees or extra levies that a 1 bedroom would be charged. Kindly note your Week and everything else stays the same, it is just your unit number that changes. This is a bonus for you because it creates room for a better exchange value since you bank your week."
This apparently only applies to fixed weeks (we have 1 fixed, 1 floating, purchased resale back in the day). Strangely, our purchase documents say we bought a week in a one bedroom sleeps 4/2 privately, NOT a studio. I'm not sure what DIK is up to with this exchange.