Bad Client Service & Experience

I visited MTN a while ago, and was told that my last deduction would only be end of July 2022. I visited MTN again today due to my installment going off double and more the normal installment for my Data contract and was told my contract already ended 11 June. I am unhappy with the information that was initially provided to me as well as the new amount that was deducted. Calling MTN is also not an option cause you hold on forever. Hopefully I'll eventually get through to cancel my contract.