Slow speed, money back for speed guarantee

[Wickermonkey]

How do I get money back for speed guarantee? I have full fiber 100, only got 5.4Mb/s just, over the last 27days only getting 36.2Mb/s and have a guaranteed speed of 90Mb/s so only getting 1/3rd of what I should be getting. Bet I won't get 2/3rds of my money back.

[JimM1]

@Wickermonkey What is the 30 day service checker history showing?

https://www.sky.com/servicechecker

[TimmyBGood]

@Wickermonkey 

https://www.sky.com/help/articles/sky-broadband-speed-guarantee 

Note that the relevant speed is the one delivered on optical fibre and ethernet cable as far as the Hub, not over WiFi from it.