FreeMe Family broken

I would like to migrate my whole family (existing Telkom numbers) onto a FreeMe Family package, this can apparently not be done without losing your existing numbers as an existing Telkom number can not be migrated to a multi-sim. For us to keep our numbers, I now first have to port my whole family onto a different network and then port them back to Telkom network onto the multi-sims. I personally find this extremely ridiculous.

Is this the truth or does the staff, at the stores, not know how to do it