Appliance Repairman

Terrible experience with this company. Quoted $80 and $30/10 min . I agreed in advance of their fees as I was told it was a 10 -20 min job. Signed a contract saying any extra visit would be no charge if no parts needed (I have the replacement part so good there) and Tech starts to unscrew the plate on the range. 50 minutes later (?!) tech says he needs his superior to come a to remove this first screw with a "special tool" on another day. 10 days later (after I make all the calls for them to return) they arrive, same single tech, no superior and now says that have to charge me another $80 plus $30/10min, even though the contract we spoke about and I signed said there would be no extra charge for the extra visit. I wanted to speak to a manager to clear this up but he would not wait and left after 5 min. Weird. Very bad customer experience.. Out $$ with no fix. Dealing with their senior management now but not hopeful for a resolution.