WORST SERVICE EVER, no help in 6 month's time!!!!!

Last year Cell C phoned me on a promotion for a Huawei wireless router with 5 gig deal.I told the him that would only take it if it was 5 gig and no more,he assured me that it was and then I asked whether it was 5 gig with night owl and or day usage and he said it was only 5 gig straight. then I agreed to take out the deal for 149 p/month.When the delivery came I got 2 sims.I told him that they had sent me 2 instead of one.I used the sim with the 5 gig on and there was no problem. When I used up the data last year it would stop working. In January they took a debit order of R2400 off my account! They told me that I had an open line and that they would send me the IP addresses of the pages I browsed.I told them that I was not interested as the oral contract as per recordings of cell C state I have a closed account, not an open one.i have phoned Cell C MANY times to sort this out, I have 2 pages of notes I took whilst talking to representatives.NO ONE HAS TRIED TO SORT THIS OUT, not even the supervisor at sales has ever come back. I'm still paying for both sims which I don't use.If no one helps me I will have to seek legal advice.This is unacceptable!!!!! My REF is ***.