We need Expert Roofers

This picture was taken last year when we all decided to hire a roofer to fix our roof. The roofs were quite old and rusty that's why we decided to replace them. As you can see, we're using G.I Sheets for our house(Galvanized Iron) which is probably the most typical type of roof here in our country. Well, obviously because these GI sheets are the cheapest of their kind. Oh and they are easy to install too. Just apply water proof paint and it can be as appealing as what other type of roofs are. However, it still depends on the roofer on how well he installed the roof sheets. Unfortunately, this guy is not the ideal type of roofer that we're looking for. We were deceived by his cheap offer and he gave us nothing but poor service. We are currently experiencing series of issues with our roof most especially the roof leaks. The water enters our house every time it rains. They said that roof leaks should be treated as an emergency as it may cause havoc into your house so I guess we should not waste any of our time and hire expert Roofers to fix our roof. This time, we have to be very careful in choosing the right man. Much better if we hire someone from a reputable agency or company to ensure the quality of their service. Any suggestions guys?
I know a company but unfortunately they are located in Oregon and that's too far from us but if you guys are looking for a professional Roofers Portland OR service, don't hesitate to visit http://www.anewimageexteriors.com/, they got the best roofers to provide the best work for your house.