Why can't I connect to my router?

[Racker Man]

I have a sky sagem router and the internet speed lately has been slow. I've been on sky's help and i followed the procedures to see why my broadband has been slowed. I got the reason however since it couldn't be solved over the internet I am not going to call customer services. The internet download speed has been less than 1mb and when i try to reset it, it stays the same. I've tried to change the channel (for about 30mins I saw it was on channel 1 and the internet download speed was 1500) but once i change the channel the router restarts but it cant be connected to anything. How do I fix this?