Internet is working when browsing, but extremely slow download speed and in-games huge ping

So this has been going on awhile now, its one of those things that for over a year its been on and off. but in the past month, it has been really bad. At the start of when it tued really bad It was when i moved rooms in my house, the route would get that orange light (im with sky) telling me something is wrong with it. I would not beable to coect to the inteet and when i could, i'd go to play a game and my ping would be around a steady 300 and sometimes shooting up to 1000!

I bought a new TP Link instead of using the USB Wireless thing thinking that was the problem, but now what is happening is: Still very high ping in games non stop (i play League of Legends and it was lagging on R also) I can browse the inteet fine (a little bit slow sometimes and sometimes not as much but it will disscoect me) when i trouble shoot, it either finds nothing or says 'The default gateway is not available Not Fixed' it is very random it has said other things like it is broken and then soojn as i click off i can browse the iteet easy, but other times it wont work for a full day.

the thing si have tried: -Flushed DNS Cache -I had two local area coections and the 2nd one wasnt working at all barely and it was a Hamachi one so i disabled it. -Changed the DNS to 8.8.8.8 alt 8.8.4.4 -reset the route to factory settings (suggesting by sky as they said our router had no problems and was working fine) -Also my download speed and upload speed has always been extremely low (suspiciously low, im talking 8gb download speed and 0.70 upload speed if im lucky, i dont know what sky is promising us because its under my parents and they arent technical at all and wont listen) -I should probably mention that we have alot of devices in the house that all work perfectly even my mams laptop coects fully. (it is not a case of they are taking the inteet away since i stay awake until 4am when only my pc and phone are being used and still my inteet will be fuy)

If you need any other information that might help please feel free to ask, im not the most technical person ever but i know a few stuff so just ask! Please help me i have college work to do and i cant even download programs that i need because they either fail or take about 4 days and then still dont end up working.