Internet has become really slow two weeks after being installed

[Hele]

Initially the internet was really fast and working well over the last few days it's become slow and unresponsive some times I opted for a faster internet than my previous and I wish I had never changed as I had zero problems wint my previous provider 

[Highlinder]

@Hele Can you please run the broadband test, this can be done either via the Sky app on mobile data or use the link below.
https://www.sky.com/help/diagnostics/sky-broadband-diagnostic/sky-broadband-diagnostic

If it finds an external fault it should enable you to book an engineer.

Does the above test give you any indication of what is wrong with the connection?