being let down by edgars store

i have an Edgars account .my account monthly instalment kept on increasing without me buying anything on account .Ithen settled the account to my surprise they say i owe because i having a data or airtime deal that im not aware of .On February i recieved saying free data and after a month wen i want to activate it to be contract i must go to the store to activate it .Which of of i didnt agree to it .i made a query more than six weeks ago each time i enquirer it seems like it my first enguiry.Iwas tild the is a refund query upto now nothing and they have an audicity to send a message that i owe them destroying my credit profile