Nobody came on activation date

Hi, 

We were due to have an engineer come yesterday to complete the installation of the new broadband but nobody came. 

I tried calling today but the automated voice asks me for either my Virgin phone number, which we don't have because we ordered broadband only, or my account number. I have checked through all the correspondence with Virgin and I have a Contract Sheet number and a Infor Sheet number but no actual contract number. I've tried these and of course neither of them works so I'm getting nowhere. I'm trying to speak to an actual person or reach somebody who can actually help me. 

Can anyone help? Is there another number or a chat I can access to sort this out?

Thanks!