I paid a plumber to replace my sewer line to the tap. WHen he dug it up, he said it did not need to be replaced to the tap and only replace some of the sewer line, but I am still having the same problem a few months later. I called him back out, and he insists there is nothing wrong with it, yet my sewer is backing up, and now he will not return my calls. I had a friend call, and he returned his call, but he will not return mine.