Up until about five days ago, I was webmaster for
georgetreetcoop.com . On October 24th, our ISP hostingdelivery.com
apparently had some sort of problem with their DNS servers which
caused georgetreetcoop.com to "disappear". I contacted them via their
problem tickets page to ask about the problem. About 20 hours later
they replied saying they'd fixed their problem and I only had to wait
for the 'net at large to refresh their DNS caches.

It's been days now and our site has yet to show up. hostingdelivery's
DNS server shows data for us:
===
; <<>> DiG 9.3.2 <<>> @ns1.hdserv01.com georgestreetcoop.com A
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 137
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL:
2

;; QUESTION SECTION:
;georgestreetcoop.com. IN A

;; ANSWER SECTION:
georgestreetcoop.com. 86400 IN A 66.98.172.88

;; AUTHORITY SECTION:
georgestreetcoop.com. 86400 IN NS ns1.hdserv01.com.
georgestreetcoop.com. 86400 IN NS ns2.hdserv01.com.
===
But that info apparently hasn't propagated:
===
; <<>> DiG 9.3.2 <<>> georgestreetcoop.com A
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 2764
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;georgestreetcoop.com. IN A

;; AUTHORITY SECTION:
com. 840 IN SOA a.gtld-servers.net. nstld.verisign-grs.com.
1193784253 1800 900 604800 900
===

To make matters far, far worse, hostingdelivery.com isn't responding
to emails or further problem support tickets. I get nothing.

What can I do to fix this problem? I'm not at all tied to
hostingdelivery.com, but my understanding is to even move my domain I
would need hostingdelivery's cooperation -- which I can't get if they
don't answer my emails.

Thanks,
John