Nedbank refusing to furnish me with details of MOBLE TALKMT that has debited R150 for 2 consecutive months without my consent

Kindly advise what I should do. Debited by MOBLE TALKMT R150 on November and December without my consent. Don’t even know who these people are. Spend hours for Magtape service to be furnished with details of the company I want to sue for invading my account.. for wasting my time and energy... for letting me incur debit charges cellphone charges petrol charges going to the bank now and then. My bank doesn’t seem prepared to furnish me with details of this MOBLE TALK MT people Ivwant my lawyers to deal with. I really have no time for this. Is closing my Chequers Account with Nedbank the only solution?