unauthorised debit order "IGA INVESTIGA661456" after MTN sales called

I received a call on the 14 February 2019 from an MTN consultant( ********** at 14:20) selling me a product because I have been a loyal client of MTN for so long. I informed him that I am not interested as I have all other commits. The reason for this complaint is that after that call on the 15 February 2019 an unauthorised debit order of R98 from a company “IGA INVESTIGA661456 190215” went off my account. So my question to MTN is seeing that your consultants have all of my information when selling products to me how sure am I that it was not one of your consultants providing these **********ly companies my details as I have no contract what so ever with them. As after speaking to your MTN consultant a debit order went off my account for an amount of R98.