I've returned modems to Primus twice and each time they claim they have not received it and billed me almost $100. The return label they send you has no tracking or signature upon receipt so you cannot prove that they received it. I was told by the postal clerk that other ISPs such as Bell do provide labels with tracking so you can prove it was sent. Primus knows that if you use their shipping label you have no proof of receipt so this must be a good revenue stream for them. The last one I returned was in November 2010 and it wasn't until I cancelled service with them in late January 2011 that they claimed not to have received it. read full review »