MTN Contract Price Monthly increase

My data contract of 24 months was suspended because a payment was not made on the 1 June 2022. The problem is that Mtn increased the monthly premium with 15% without notice but it is apparently contained in the fine print of the contract that they can increase the contract value anytime.

The higher amount was rejected on the debit order system. The Vredenburg branch of MTN in the mall could not help .