Astar Heating + A/C

They install a new boiler in my home, but the problem is that there boiler keeps rotten the pipes they used to hook to my pipes ( which is stainless steal ) which they used galvanizes,and now I smell exhaust from the boiler as the pipe has big holes in it and it enters my home as the boiler is in my garage next to the bedrooms. this has been a on going problem since they put it in and they keep telling me they are going to fix it but now it's been like maybe 4or 5 years and they still haven't fixed the problem. Can you help me solve this problem thank you