I don't want kia anymore.

Hi I'm Tshepiso. I bought kia Rio 2019 model at Kia Roodeport Ondegers rd on 24th may. I realised that I cannot afford to pay the car because it leaves me with no funds in my account. I went to kia Roodeport to tell them about my matter and they told me that the car belongs to the bank now. I went to the bank and I was assisted. My bank was standard bank. Standardbank informed me that it is possible to take car back to Kia because I only had car for less than 3 months nd kia can refund them then I will owe Standardbank R2500. I don't want the car anymore because I feel as though I was overpriced and I got bad service at Kia. I went to kia for the last two weeks and I was been told that they cannot cancel the deal after they made me to wait for long hours. The manager there who was a lady was even rude to me and told me that I am now the bank's customer and not kia's customer. I am so stressed and don't want the car anymore. Please help me