Please can you assist

I own a South Africa company and was contacted by Milton Parks from madison Who's Who, who gave me a long winded reason as to why I should subscribe to the. It was enticing, so I went for it only to realise afterwards that this company is fraudsters.
They have already transacted against my account. I have not sighned any authorisation as yet and I can only dispute this once it goes off my account.

Please can you assist me in getting this resolved. I need them to void this transaction, but also be shut down for false marketing and advertsing.

Brenda
+27 31 4640920