MTN Pathetic!! Please check your bank account for unsolicited debit orders!

Last week it was an unsolicited debit order of R149.00, this week its another of R766.85. I encourage people to check their accounts for debit orders without mandate. I last dealt with MTN about 5years ago. I have never agreed to any new deal neither have i been in contact with their contact centre. I challenge you to provide contracts for the debit orders you are charging my account!