Hired a car, they demanded more money and refused to refund me

I hired a car at Rental Cars Europcar for a date that was almost a month away and paid R1268.00 which I paid through my debit card, on the day of collection of the vehicle I went to the outlet and when I asked about the car they told me I must pay R13000.00, which I didn't have I then told the Sales Consultant that I am cancelling the deal as they didn't tell me about the 13k they then said I must request a refund online as my booking was made online, needless to say I didn't take the car and I left, the following day I requested a refund online and they sent me a mail, that I didn't meet their terms and conditions ( which I was not aware of) and said on those grounds I will not b getting a refund from them as I should have requested it at the counter, this is one pathetic sevice.