Charged twice and still not received items

I ordered a radiator and some spark plugs last week, paid using instant EFT. At the end of the transaction, it stated that the transaction had failed. I tried again the next morning, this time using my credit card (don’t usually like using it online). The transaction was successful, unfortunately so was the previous days transaction, so I paid twice for the same items. Trying to explain to the online agents what happened was a complete nightmare. I submitted screenshots of where the amounts went off on both accounts. A lady by the name of Vanessa was helpful in the end and told me the accounts department would contact me. Cut a long story short, nobody in the accounts department made contact and the final straw is that my items haven’t even been shipped yet. I now want to cancel everything and request a refund x 2. Next step will be to open a case of theft with SAPS. I do not recommend anyone to use this company, you have been warned