Complaint Review: Ways to save

Put 1,000down on truck 2003 extra..Nissan check light was on they charged me for repairs that didn't fix problem...every month I have issues of it running...paying truck off in may or June... Work that was supposedly performed I've had to pay to get it done again....it's a drain of m.y account. .to date check engine light still on...getting starter fixed again...it was done by them last year...and it's having same problem this week....it's as never ending night mare. Tired and need someone's help on this. They don't even say...it's warranty covers part they just say I don't know.