Bad Service after Billing Error

On 03/07/2015 at 19:46 on my way to Durban i pass through KFC north rand road to buy a 21 Piece bucket, but they double charged me R4419.80 instead of R209.90. they said it will reverse back soon, so i waited 20minutes but i did not reverse then i continued with my journey. On Sunday morning on my way back i passed through them again and they took the till slip to verify and they confirmed that i was double charged but they will unfortunately not refund me until i bring a bank statement.. I told them that i am staying 37km away from them, but they said there is nothing they can do, without any apology. On Monday at 08:24 i spoke to their head office customer service (LAVIN) and they said i must send them the till receipt of which i did immediately but up to so far i have not received any feedback from either the Customer service department or the Store as promised and there is no refund yet. I called the Head office (Landela) and said the procedure is to wait for the customer service Department before aproaching them.