Shocking - their email hosting for business is a joke

We are a small online retail business, - we process many orders every month - we decided (for security reasons) to host our website and email separately using Absolute's business email package. I noticed that many emails from our customers (even those sent via our contact form) and mails from agents were being incorrectly classified as spam, despite my adding them to trusted mail lists. I was told that I couldn't whitelist at a domain level, but would have to ask each agent to do so for themselves. I then requested that the spam filter be adjusted to allow business mails to be delivered. The only solution was to turn off the spam filter. In addition, there was a problem with invoices not being mailed to customers, 67 invoices were not sent at all, in the space of a couple of weeks - about a third of our mails. One of our agents then sent out order confirmations to 100 customers, using Woocommerce bulk invoice processing. Our email address was taken off line, we were told that we were spamming and despite my explaining that these emails were 100% legitimate we were forced to pay R500 to have our mail reinstated. It's impossible to speak to a person there, and the email support will not engage in any meaningful way. Of course we immediately changed to another service provider. Don't go anywhere near this company.