Should i buy a new Xbox 360 My Xbox 360 got the red ring of death and then we spent 150 to get it fixed now 4 days later i get the red ring of death again so should i buy a new one.

You should get a new one then its going to keep doing that if you don't probably.......No you should take it back to whoever repaired it and get them to fix it for free, as the repair should be covered by a warranty.