I've tried multiple routers. Line quality is fine.
Rang slingshot and was on hold for 40 minutes and was told this. Was told that this would be sent to the 'network team', however, when prompted - they would not provide a case or reference numbers nor would they give a response time or agree to call back. Given past experiences, I'm not entirely convinced that they are being completely upfront as most helpdesks can typically issue reference numbers.