Vox Telecom

After trying to cancel my subscription with them I was sent an amount that was due that I didn't understand. I spoke to two of their consultants over the phone trying to get them to explain how they arrived at the amount I was owing even though my service was even suspended. I even went as far as to email them and received an automated response with a reference number ***5. Nobody got back to me instead instead the amount I owe moved from R300+ to R2000+ in a space of one month without any internet service provided nor explanation