Multiply cancelled, but they're still taking my money!

I cancelled my Multiply membership via email and received a confirmation letter from Seziphelele Dlungwana stating that it was cancelled effective 15 September. Since then the multiply fee has STILL been deducted monthly from my bank account. I again contacted Multiply to find out that they do not know such a person as Seziphelele Dlungwana. I then spoke to a lady named Ceralba Hurling and forwarded her the confirmation email as well as proof of the transactions against my account requesting a refund of the fees. The email was sent on the 11th of January and STILL I have not received any feedback or refunds on these fees that total more than R1400?!