I've heard back from my contact at Vodacom. (cough smitty cough):
I have looked at this clients complained and have established the following: We have in the passed received similar complained from this company (Platinum) Firstly they are not a WASP service so they don't need to comply as stated. They are a company that do sales and use random cell phone ranges prefixes 082 445 xxxx to SMS clients or call randomly. If the client wants to stop them from contacting him, he needs to call then and advise them accordingly.
Sounds like they are from Cape Town, (but north of the borewors curtain).
So, I phoned them... Naturally, I ended up at a voicemailbox (for extension 1649), so I asked to be called back. Lets see...
If I don't hear from them, next stop is the Ombudsman for financial services.