Watch your credit card

I rented a car through an online site, probably autoeurope, for 9 days in NOV. 2013!! on MAY 30th 2015!! They took R580 from my credit card, I requested details 2 weeks later I was sent an invoice for 2 days car hire, this inv. just showed a payment by voucher for 7 days & an extra 2 days outstanding my signature was no where on this , their explanation was that I had extended this rental without paying &