Edgars charges airtime that I don't receive.

Good day I have an Edgars account, I have had it for 13 years without skipping an installment, I purchased data from cell C using a ussd they provided, they have been deducting R109 from my account but I have not received it, this is the 4th month, when I take it up with them they sent an email saying it's not their fault it's Blu connections, I don't know that company I opened my account with them, now when I have a query I'm being referred to people I don't have dealings with that's so unfair, I'm a loyal fan of Edgars but at this stage I will pay this account and close it, I am so disappointed can they please refund the money they have been deducting without getting a product I purchased.