In an email, the owner of the company told me this was "excellent workmanship", and he said he wouldn't fix it, informed me that he would sue me for slander if I left a negative review, and he would send me to collections if I don't pay by the end of the week (a total cost 60% more than the cost I authorized). I know there are unforeseen costs sometimes, but the hours billed don't match the hours onsite.
I'm having another contractor out today to tell me how much to fix. sigh.
Any suggestions for next steps?
Yes, they are licensed and bonded.
Several things you should do.
1. Put together a file with estimate, and actual contract, and any existing communications you've had with the company.
2. Immediately start all additional communication via email, or text, and retain it so you will have proof of the owners failure to correct the problem.
3. Get a couple other companies to give you their written opinion, and a written opinion of what it will cost to rectify the poor installation.
4. File a small claims case against the company requesting they cover the cost to repair the poor installation.
5. Inform the company that you have filed a suit.
If you have all your paperwork, and documents from other professionals, showing that his work is substandard, you will win.