Absa's Faulty Debit order systems

In January my account was debited twice for a vehicle installment, when i called the bank to ask they said i made arrangements for a pre-payment so that i could pay off my vehicle quicker i advised the agent that i did no such, after making me hold for 20+ minutes they corrected the mistake (which i incurred charges by the way because there was not enough funds for the second debit) on the 15th February they were suppose to debit my account for the vehicle installment they did not so i decided to call the bank on the 19th to ask why have i not been debited for the vehicle installment, the lady advised that the gentleman that was helping me with my initial query deactivated my debit order but she said she will sort it out and apologised she made me hold for 15 minutes she came back to me and requested to do a once off debit to settle this months installment she asked me to hold again i held for 30minutes until i had to drop the call, few minutes later i receive a call from Absa collections this lady is screaming in my ears that my acount is in arrears i did not pay for this month when i tried explaining to her that i am the one who called the bank in the morning to ask why was i not debited as i was explaining she said oh so you have funds in your account we will debit bye bye she did not even give me a chance to explain what has happened she was so rude. firstly its the bank's fault that they had problems with their debit orders, i took the initiative and called them now this lady is being so rude as if there were no funds in my account when they debited or something. i am extremely angry, i am shaking with anger i dont deserve this kind of service, i think Absa is the worst bank ever i will write on all my social media walls for people not to take any products with Absa!!!!!!! two months in a row they are messing up my bank account nxa.....