there's several "simple" solutions
1. cut all your neighbors phone lines if it's DSL. Then it won't be shared by as many.
2. get your neighbors to switch ISPs instead
3. play at 3:00 AM when nobody in your neighborhood is on
4. just switch ISPs!!! And to one that's NOT DSL!\
you can eliminate a tiny bit a lag by also buying a superfast gaming network card and getting a faster router if U have one but if U got disconnect problems, it won't help that, just speed up lag by about 5-40 ms tops.