Double debited my account, second debit was unauthorized, delayed Refund

On the 19 of September 2017 I was involved in a Car Accident. I am Insured With FNB and through FNB & Gage Car Hire a Loan Car was allocated to Via First Car Rental. on the 21 of September 2017 First Car Rental delivered the vehicle to my work address and I paid them an amount of R 1 250.00 which went off my credit card which my bank statements reflect the amount that went off. On the 23 of October 2017 they collected the car and they clearly stated that in 7days I will receive my deposit back. It has been more than 7days and I have not received my money back. On the 02 November 2017 i was called my First Car Rental and spoke to Shaheen and he advised that they don’t know where the deposit was allocated to them which just shows the incompetence of their accounts department. I advised him that my deposit is still owed to me and I have proven on my bank statement that the amount of R 1 250.00 went off my account on the 21 September 2017. Shaheen then advised that I would be paid back an amount R 1 000.00 in two working days. i checked my bank account on the 3 of November 2017 and seen that first car rental without my consent went and debited my account again with an amount of R 1 250.00, that is against the law you cannot simply just debit a client’s account without their consent. they have now taken R 2 500.00 which R 2 250.00 is due back to me. this is disgusting and if I am not refunded in full by the close of business today i am going to take legal action against them.