Hi Trojan,
Based on your situation, I suggest you try it in other browsers. Meanwhile, you can change to another network environment to see if it works. If the issue persists, you can refer to the following articles for help.
For Office 365 for professionals and small business
http://onlinehelp.microsoft.com/en-us/office365-smallbusinesses/ff652569.aspx
For Office 365 for enterprises
http://onlinehelp.microsoft.com/en-us/office365-enterprises/ff652548.aspx
For the time being, we provide forum support in this community, so can not call you now. You can also directly contact our sales and billing team via g.microsoftonline.com/.../280
Thanks,
August Sun