TELKOM still Invoicing for Services not rendered for 18 Months - *****/Embezzlement?

In December 2017 I moved house and wanted my landline and DSL moved. Telkom could not do both so I asked that the number be blocked so the new ownes could not use it. they blocked it then failed to transfer the line anyway. By Feb 2018 after numerous calls to their call centre and Bayside branch I asked that the whole lot be cancelled and eventually got an invoice stating I was R54 in credit. Since then I have been hassled by e-mail and SMS to pay amounts up to R5454.09 for services not supp****. It seems like they can not clear and cancel the account while the phone is blocked and they cannot unblock the line until the account is paid - a Catch-22 situation that nobody at Telkom seems to be able to resolve. The worst thing about it is that there is NO ESCALATION PROCESS in place. Its the same call centre people who have no authority to get this resolved. WHERE IS THE ACCOUNTABILITY?