VODACOM ROBBING US SOMEONE PLEASE HELP

I am so disgusted with vodacom. I cant believe this company still exists. I am a new customer and took out a data contract (100gig day and 100gig night) for R999.00 p/m end August 2019. This package is used at my holiday house only. So we use it every second weekend. So my first account comes invoice date 28-08-2018 due 31-08-2018. R258.98. Second account invoiced 01-09-2018 and due 30-09-2018 for the amount of R4362.09. Billed for data usage 3k alone. I contacted them ans sent them photo of 68 gig day still avail and 99gig night. How can they bill me for data if i still have data avail. They come back stating there is no problem on there side but because i am a new customer they will credit me R2K leaving my balance to pay at R2362.09. I then emailed again and said my 100g data plan contract is for R999.00 and not R2362.09. No response. Then i received the next invoice dated 01-10-2018 due 31-10-2018 for the amount of R8889.15. Data left 87gig day and 100gig night that is still avail on my contract. They charged me R6728.91 for data but still had 187gig avail. I drove to Century city, tygervally, cape gate email, phoned and there answer was we see a problem and will get back to you within 21 days. They have switched of the service 10-10-2018 till current. Outstanding account is over R11K + the so called R2K discount. I have been listed at trans union as being 30 days late with R9K outstanding. This has reflected very badly on my credit profile and costing me hours and hours, driving km-km, emails and emails, hours on the phone from one agent to another. What the hell are people in our situation suppose to do. This is a nightmare.