Contract cancellation

I took out a car finance with wesbank through definitive edge dealership in february. My name is Patronella Refilwe Mogane, wesbank account number( ***). I sent through a cancellation request over a month ago. The car is no longer with me i took it back to the dealership. I am still awaiting confirmation that the contract has been cancelled, i called wesbank contact centre on more than one occasion because i cant get through to the person dealing with my cancellation i was told it is Wisaal Saley even switchboard can not put me through them. Their lines dont work, this is the number i was given ***. How long does a cancellation take? The dealership agreed that i can cancel. What is the delay for? I do not want to find myself being debited for a car i do not own and again it is a debicheck debit order i can not even reverse it. Can i be given feedback and can the contract be cancelled before the 25th of march as that is the first debit order date.