Vodacom contracts ****

Vodacom is a ****, i had a contract with them around 2020 if i am not mistaken, cellphone and airtime. I cancelled the contract immediately after the period ended. They have been sending me zero balnce invoices and statement with the amount of - R192 the last invoice was for 01/08/2025. I do not use the number anymore, on December an sms from attorney stating that my account has been forwarded to them, that owe vodacom money. For what? What is worse i cannot even call them, their customer care number is not user friendly.