****med by Linkedin

On the 24th December Linkedin deducted R6 899.86 from my bank account without my consent. The reference for this deduction is LINKEDIN-783**** LNKD.IN/BILL IE. I have no idea what this is for. I may have signed up for a free monthly trial of Linkedin Premium. Even if it was for that, I still do not have a Premium account which I do not want anyway. One cannot seem to reach this company and on their website they actually have a place to query "Unrecognized Charges from Linkedin" which DOESN'T WORK!! I want my money back!!