Unsolicited Debit Orders _ Discovery Credit Card

I was going through my bank statements and have to find insufDDA purchases payments that attempted to debit me. One of the 29th of October 2018 and again on the 29th of January 2019. I have not given anyone authorisation to debit me and both these payments differ. One was for R4495.12 and the other is R4382.12. Can Discovery Credit Card department please advise as to what this is for and who the company is that is doing this. I would appreciate your immediate attention to this, as I am concerned. Please note I don't owe anyone money so this shouldn't be happening.