Telkom's inefficiency affecting credit rating

Thanks Telkom. I cancelled my landline and ADSL late 2019. Today I find that my credit score is being affected because you issued an invoice months later ... and are repeatedly telling the credit bureaux that I owe the money. R157 or so. I have tried getting in touch but it's impossible to get past a Bot. Or they leave one hanging. Over it! Your inefficiency is affecting your (past) clients' lives.