Unauthorised debit order by momentum multiply

Momentum Multiply deducted my money from my account without my consent and they claimed that I signed for it using brokers and marketing advisors. Financial adviser name MR MW DU TOIT Marketing adviser code 006074 Marketing adviser name MRS E GRAY. I am frustrated and as a student, I don't have money to buy food because of momentum. I have been paying for my yearly subscription without problems but they have decided to ***** my hard-earned cash through bogus brokers who have used my personal details to create a debit order.