Vodacom with poor service

I am vodacom contract customer I stared this contract last year but by far I'm getting a ****ty service when I phone to complain agents lie to I lost my job during and I phone vodacom and I explained that I need them to cancel debit order for now I will pay cash because they is no funds on my bank account they agreed but that was a lie because every month they go to my bank account trying to debit even if the cash is paid and when that debit bounce they and R200 like my contract is R299.00 a MONTH but now I'm owing the more than R1000 because of this R200 they keep adding why they agree to cancel debit order everytime when I call knowing that they lie.....please I need help hellopeter. Another problem is on my contract I get R175 airtime every month so there is a lady so called me and lie as Vodacom lie allo the time and that lady said to me i must add R75 on my payment they will give me extra 1G on my account every month only to find out that she's taking me out from the plan of the R175 airtime to 1G but with the additional amount of R75 on my contract I have been calling vodacom for 6 months now they keep saying they will fix it they escalated... I truly need help with this one too please hellopeter. Thanks in advance Nobility.