Poor service

Around April 2022, I cancelled my contract with Vodacom Fiber. Immediately after that I was handed to MBD who harass me everyday, I have requested for a settlement account in a written form. For 6 months now, I received nothing in written form yet they keep increasing the interest, last time I was told it was +/-R659 today it's about R1500. They kept delaying the processes so that they can have more interest on my account. It's the 2nd time now I complain on Hello Peter regarding this matter, please can someone come to my rescue