3 days and still no username and password

I ordered my fibre and when my area went live they came out and installed my router. This was 3 days ago. That same day it was installed I contacted Emelia Aphane which helped me with the sale. She didnt respond via email after I had sent the serial number. I contacted her via whatsapp and she responded that a username and password will be sent. The next day i told het its taking long for just a username and password and she said she would escalate to management. Its now day 3 after installation and I complained via email yesterday with a ref number VOX***1 and still no problem solved. What do I have to do to get a username and password for the modem that is just lying here for 3 days? My boss got fibre through afrihost and his internet was up and working 2 hours after installation? If I dont get a resolution I am cancelling vox and I will not speak good things about the company