I am not satisfied with the work my dentist provided, can I get my money back and get a second opinion? What should I do? Help

I had a root canal and crown done at my dentist.The first time I went for the crown, my dentist realized that the metal part of the crown was made too high that he trimed all the porcelain I still dont get a good bite.He said that he would have the lab redo it. I told him that I would want the lab to start from fresh, not just put another layer on top of the already metal-showing crown.My dentist agreed.I had my crown a couple weeks later.Six months later, metal is showing on that crown.a different dentist from the same clinic claimed that it's very common.They sent the crown back and the lab just put another layer on top.He agreed to give me a new crown but he will have to cut my real tooth even more to have space for the crown and he cannot gurantee I dont have the same problem. Help!