Fax server down for almost 2 weeks and no progress by tech support—help!

Our fax OS was pretty old but fax server was working fine. When ecw upgraded their server software, we were advised to upgrade to Server Essentials 2016 which we did. Now nothing working for almost 2 weeks and no solution in sight.
We got a tech who does not know how to create a user in windows so my practice manager had to do it for him.
Then the mainpine guys worked on it.
Still no faxes going in or out and we are a rheumatology office which means we have so much paperwork (biologics orders, Prior auths medical appeals, etc).
We need some major help.
We can manually fax outgoing faxes through another telephone line and an old fax machine, but we need some advice for work around for the incoming faxes. We have had the same fax number for years so the insurances, hospitals etc are complaining that they can’t send us faxes.  We get 100’s of pages a day so we need a work around until this gets fixed.
Any advice appreciated.