So if we blocked this site in question: megaboon.com i couldnt access, (That i can on VDSL, ADSL, and mobile) Someone else on cable so that rules that aspect out. Now its an end user fault here.
Trace routes, Pings, NS Lookup, Can you access the page by going to its IP? (Found by running a ping) Reply from 78.138.105.29: bytes=32 time=297ms TTL=49
Please name 1 site that isnt filtered by us?
No luck resolving site via IP