Unauthorized transaction, tracker *****sters

I am writing to report an unauthorized transaction that occurred on my account on the 18th, i got a debit order mandate from tracker that i never authorized or agreed on, amount is R188.

I did Not authorize this transaction, and I believe it is *****ulent. I request that you investigate this matter immediately and take necessary steps to reverse the transaction

The only contract amount i have with tracker is the one of R94, the one that has already been deducted on the 15th of March by tracker