Vox Telecom - Disappointing

We have been dealing with Vox Telecom for over 5 years. Their call centre cannot be faulted, however, their internal processes need to be addressed. They invoiced us for services that we had cancelled months before. Of course we were happy to pay, but requested credit notes to nullify the incorrect billing. The credit notes never came after numerous requests. They then sent us a suspension notice, giving us 7 days to pay. That said, after 4 days they just suspended our services, and wanted us to pay in full (including cancelled services). Very disappointing, as this caused a lot of unnecessary stress and loss of business. We have always paid our accounts, but we have an ERP system and policies that need to be adhered to.