Paid twice on portal and amount never allocated!!

Supersonic has the worst customer service ever. They give the option to pay on the portal, but once the payment went from my account it give an error saying my account doesn't exist. First I tried the debit card option, then after the amount was deducted it gave an error message that my account doesn't exist. Out of fear that my line might be suspended I tried a second time using the EFT option. The amount was deducted from my account again and got the same error message. The outstanding amount is still on my account!!!! I want to be credited with the extra amount I paid and fix your bladdy payment system!!!!!!