Worst vehicle finance ever

I got my car under absa finance, the first debit never went through after stating that I want my debit to go off on the 15th of each month, up to date no debit was made. now they telling me payment came back as unpaid. no one calls I am calling everyday I receive no assistance, they keep on taking me from pillar to post. my first car was with Wesbank I never had any problems with them, but this one is soo useless I wish I never even accepted their car from the start. it is my first and last using this useless bank.