MTN unauthorized debit order.

MTN AND SUMMER MOVILE I was contacted by Summer Mobile on 5th April 2024 to upgrade a data contract that was coming to an end in July. I signed up for a R199 pm 24month contract. I called MTN on the same day to verify that it is only R199 which they confirmed. Today on my banking I see there is a debit to off on the 7th for R2170. I DID NOT SIGN FOR THAT. I SUGGEST MTN CONTACT ME AND RECTIFY THIS BEFORE 7TH JULY SINCE I HAVE TJE CONTRACT I DID SIGN AND IT IS ONLY FOR R199!!!!