Shockingly poor service and *****ulent activity by MTN

As a long standing customer of MTN (since 1987) I am totally apalled at the service my daughter has received from MTN on her 200Gb SIM-only contract. She has been complaining through every available channel that the data has been used *****ulently. She has removed the sim card from the device for the last 2 months and the data is being used completely every month!!! How does this work and nobodody at MTN assists her despite nearly 100 phone calls, multiple emails, reference numbers given and then closed in 5 minutes and requests for the contract to be cancelled simply ignored. She started complaining on 10/08/2023 and has continued to date. I have now advised her to simply cancel the contract from her side via email and stop the debit order with her bank as the MTN contract says it can be canceelled if MTN fails to rectify the problem within 20 days....well it has now been nearly 90 days without any sign of resolution. Very, very poor show MTN.......