Worst service on the planet - Standard Bank Vehicle Finance

I had the worst experience imaginable with Standard Bank Vehicle Finance. I have called them 16 times over 6 months asking them to extend my vehicle finance from 3 years to 6 years term. They requested supporting docs which I sent through more than 24 times to Katleho, Gabriell, Elelwani, Rosemary, Ernest and Toney. They are unable to extend my vehicle term. They cannot give me a reason. They keep saying that someone will get back to me, and to date standard bank has not called me back once. Im so angry, desperate, down and out.