Legal Question in Consumer Law in Texas

Number one, a "verbal agreement" is a contract (with a few exceptions, such as a verbal contract for the sale of real estate).

You should write a letter (paper letter - no phone calls, no emails) to the repairman and spell out your complaint, and ask him to (1) come back and complete the work or (2) adjust his bill.

Keep a copy of the letter.

If you don't get a response, send him a check for what you think the job was worth.

Once you contact a local attorney you may find that you DO have a contract. Oral contracts are valid and recognized in Texas. Try Texasbar.com and search for an attorney near you that deals in CONSUMER LAW. Many give you a free consultation. Another option is to contact the Texas Attorney General's Office. There are laws that protect consumers and they are happy to enforce them. Good Luck!