Premature cancelation not processed and account handed over to attorneys with no notification

Premature cancelation done, paid up and proof of payment emailed to cancelation department however Not processed!! Fast forward 6 months later I'm sent smses from attorneys demanding payments! No call, no invoice /statement, no email from Vodacom or these attorneys advising what is owed and for what. Now who is liable for this when I have done my part and canceling this contract and sending the email to your email provided. Pathetic customer service from your call center staff and the business itself. How do you just hand over accounts with no communication with your clients. Went into the store yesterday as well only to find out you guys had my laptop number as a contact number?? Cancelation was logged on the day I paid up however it expired!! There was a reason for a premature cancelation not sit with this month's later!!!