Unwarranted Billing Migration & Account Suspension

I did not receive my July contract bill. In order to pay, I used the myvodacom log-in and paid amount stipulated online. I had also received an email AND a telephone call that said that I had been selected to be part of a new billing system and that my account would be migrated if I so wish. I REQUESTED THAT MY ACCOUNT NOT BE MIGRATED and that I was happy with the way the billing currently works. Around a week ago, I got a collection call for an outstanding amount and requested that an invoice be sent as I had not received one as I always have in the past 10 years. I did not receive an invoice. Yesterday, i received another collection call. I explained that I have no way of knowing what outstanding amount was being collected as i had paid what I saw as due on the vodacom online system AND that I had NOT received my monthly invoice per usual. The collection agent then threatened me with a disconnection for refusal to pay and my service was suspended a short while later. In the meantime, I had called customer service and lodged a complaint (Ref 1-***) to explain how I had never received an invoice and being migrated without my consent. No I have no working line and no help.