lol I've been going back and forth with support for 2 weeks + now, all they do is come up with excuses to delay and send u in a loop over and over again as every reply is from a different person.
1st it was the VDSL stabilising (even though I mention it has been on going since ADSL), then it was wiring and modem.
Unless my wires decided to come to live and break it self during peak hours and fix it self after 2AM, doesn't take a genius to see there's clearly something wrong here and there's a pattern.
The only reason I've not cancel my contract with them is that I've just signed up a week ago and will cost 200$.
If I were you and am contract-free I would gtfo asap.
I'm positive I can fix this issue without changing ISP's.. If most Slingshot customers don't have this issue then it can be resolved I hope..