Telkom unrefunded

I have a data contract with Telkom Which is R219 monthly this December i paid using EFT as I was told to do so on the 26 of December on my suprice they debited again on the 31 December and when I reached t them they told me to sent proof of payment to get my refund since then I tried again today they told me they will call but never . Nokwanda Xaba ***