Best Energy Efficient Water Heaters in Boston MA

I had CTW Plumbing and Heating for several plumbing jobs. He did not supervise his plumbers, delayed fixing unfinishied job and sent some bills almost 9 months later for a return visit and other paid job. CTW owner Caleb did not supervised one major job that cost close to $3,000 of repairing heat pipe. His plumber left metal end caps bend and stuck out in several places. Only after I asked him repeatedlyl to send plumber to come back to fix the end caps, he sent one but still many places have loose end caps that stuck out its sharp metal edges for my rental apartment. Caleb 8 or 9 months later charged for the visit. He also sent me overdue notice for the work that was paid on the day of job again 9 month later. I provided paid receipt from 9 month ago.
He did not listen but stubborn, argumentative, and arrogant instead of straightening things out and He could not provide free services. When did he provided free service? I still have end caps that are loose and open.