Parker and Sons review: No resolution to problems

I called Parker and Sons to get rid of sewer smell in men's and women's restrooms. Tech never showed for first appointment; I called them to reschedule. Tech came the next day, was here only a few minutes, left for parts, and when he returned, he placed traps in restroom drains and said he would return to finish the job and collect his money. He made several attempts to put cameras down the pipes, do smoke tests, and finally suggested we cut 8 holes in the restroom walls for the smoke tests. The smell remained in the restrooms and we received a bill for $2,664.00. Nothing was resolved but we received another estimate for $5,277.00 they wanted to supposedly fix the problem. Upon talking with the company representative, we did get a $500.00 refund, but there was no way we were going to pay them an additional $5,277.00 when they had not done anything to solve our problem. I would never hire this company again or refer anyone else to hire them.