MZANZI$U - Unaothorised debit order against my account

I have receive an sms that this MZANZI4u thing lodged a debit order of R99.99 against my bank account. The number listed on the sms is not working. Can you please come out and explain for me what kind of business is this and how did it get to my account or cell phone number. Please cancel the debit order you lodged against my account now.