Very BAD client service and MONEY THEFT

I worked for cell c about a year ago and they gave me a WORK contract for WORK purposes and when I quit my job at cell c I gave back my phone with everything in it due to the fact that I wasn't able to afford the contract, I do not have the phone and SIM CARD nor have I had the thing from 22/12/17, and from Febuary 2018 Cell C didn't tell me that they're going to put the phone on my personal name and i never signed a contract with them to say that they can put the thing on my personal name, as I have 2 data contracts with them as well, they started charging me for the phone contract that I don't have and they told me that I had the sim card, yet I didn't have the phone or the sim card so I couldn't use any of the benefits on the contract so I went to them and they told me they can't assist me with this problem. So I went reversed my debit order due to I'm not going to pay for something I don't have any use of and only paid my amount for the data contracts that I had so they blocked my 2 data contracts with them due to me not paying my amount but I did pay my amount for my data contracts. Now they don't want to assist me further due to them wanting me to pay the full amount for 3 contracts where as I only have access to 2 of them before they will open my lines.