Yes we do have an ADSL line with Telkom.I've found something I think all of the targets have in common - the scammers seem to always phone on the ADSL line (which is almost never listed anywhere) and they susbcribe to Telkom ADSL.
If true I'd say a Telkom employee has sold their database or someones hacked it.
@Park@82 - is that what happened to you?