Requested service at the nursing home where I work...

Requested service at the nursing home where I work. The service tech discovered a faulty temperature and pressure valve on one of our water heaters. After a week had gone by the new valve failed. Requested service again. Another tech came out and said further work was required and he would send an estimate. 3 weeks later no estimate. After several requests to receive an estimate we gave up and contacted another company. By the way, all this occurred before the big freeze.