Cell C has done it again.. Bad customer service

Cell C has done it again after the good service I was getting after the first incident.

I called Cell C customer service in May/June 2018 for an upgrade and spoke to one of the consultant (Nhlanhla). I explained to him that I want an upgrade for data, he explained that the package I want I don't qualify for it he then advised me that I take the R199.00 with router and I agreed to it excluding the router. He then told me to decrease the monthly limit on my bill and I thought that's how they work. He had changed my line into an open line and now I'm supposed to pay R440.00 for something I didnt agree to have in the first place. I have made several queries regarding this situation and I have yet to receive help its been 3 weeks now having a meaningless reference number while waiting for Cell C to review the recordings. I hope one of the Cell C PR will see this and help me somehow. Bad service indeed and its not the first time doing this because when I took out the phone contract I was suppose to get 100 airtime for the duration of the contract and then I told the Cell C consultant who was helping at the shop to add data for R45.00 I don't know what he did but I had never received airtime. Cell C has been nothing but a Nightmare for me.