Vodacom Excessive billing - Disgusting Service provider

I took a data contract with Vodacom 2 years ago. My current installment has been approx R530 per month until Aug 2018 . I received a statement for Approx R1600 for billing in June 2018. I immediately phoned the call center to enquire. Immanuel was the call centre agent that assisted me on 10 Aug 2018. He says I was billed out of bundle rates as my line was not capped. I requested my line be capped immediately to avoid a repetition of this. He assured me my Line was capped. He asked at how many Ggs I want it capped. I said at 20GGS as that is my limit. He then called me a few days later to give me feedback on other amounts on the statement. To my Knowledge my line was capped. Until October 2018 I received a bill for R3785.54. I called the call center on 1 Oct 2018, spoke to Wendy. She says the Line is not capped and therefore the excessive billing. I related my call to Immanuel on 10 Aug. She said she will need to escalate to the the Solutions dept. I then received a call from Marius a few days later who says the billing was for 28th R2400, 29th R270, 30th R20 Approx. I said my line was supposed to be capped on 10 Aug. I asked him to listen to the phone recording on 10 Aug with Immanuel. He says there is nothing in the converstion about the line being capped. I find that hard to believe as that was the purpose of my call. Marius was very unhelpful and said there is nothing he can do. I did say it is unacceptable and I will take it further. I then called in again on 15 Oct and spoke to Mphume Gaba. She said there most definitely is an error here and she will send this bill to be credited, it will take approx 7 working days. On 26 Oct my bank account was debited for R3785.54. I then sent an email to Vodacom asking them to look into this query. To date I have still not received any feedback. They leave me with no choice as I will have to now seek assistance from the telecommunication ombudsman.