I've been with Auctiva a long time now(years). It always has been, when it works it's great. But, it seems like about every 3 or 4 months they have major server issues. I quit using their pay service because of it. I came back with the new service.
There never has been much support on the weekends and probally never will be.
It's one of the reasons I quit posting auctions that close Sundays. Your going to have to deal with it or change services.
If anyone has any suggests please let me know. I don't have the time to research them.