Please can someone from Trudon get back to me?

I call the landline - it says they are following Covid protocol and must send and email. I call the call share number - it puts you through to Telkom? I send emails and have no responses to my query. I spoke to Telkom yesterday who've handed our account over to debt collectors because Trudon are billing us. Yet I cannot reach anyone or receive a response from Trudon to find out what we are being billed for. The account was cancelled in February.