Unhappy customer

In 2016 we took a contract with cell c it was a voice deal with samsung Tab E tablet in april we phoned to settle out amount and cancel contract. And about a month ago I received a sms saying I have been handed over to attorneys for not paying me cell c any how I found out that I also had a data deal line which I wasn't even aware off as I never received the sim card so now I must pay for something I never had the reference nr is ********** 662 and the amount is R684 I keep on paying and paying cell C but I never stops and in store its shows both lines have been parmanently deactivated. I AM VERY UNHAPPY WITH CELL C and in my life I will never do business with cell C ever again.