the fastest way to lose your customers

Despite some bad reviews -this happens to a lot of sites- I gave Poppydog.com the benefit of the doubt and tried their service as a paying professional user. I gotta be honest: their web registration tools work really well, no doubt about that! And I was happy to have found what I needed for my website.
But now, 30 July 2016, and two months after having set up an account with Poppydog, the service has been down since a couple of days. Completely down, worldwide. No messages to theit customers, no explanations, nada. I have even mailed them about this, but -of course- no reply so far.
I can't operate my site one single day without a registration and login system, and I am just a little lucky that this is occurring during this quiet time of the year (for my site). If this happens a couple of months from now, this would turn out disastrous.
Unless I see some major improvement very shortly, I will have to find an alternative. Really too bad, a really good system, but this is no way to run a business site.