Robinson's Manufactured Home Service

Lets start with the bid, get it in writing when dealing with this companyI was bid $dollars to replace a Mobil home water heater and repair damage to the supporting floorWork daythey showed up to refresh the memories regarding the jobApproximately 4,hours latter they returnedThey came unprepared i.e, lack of parts and laborers to install heaterAfter finishing the job with help from my crew doing another job at the work site I got the billNot only had they reused most of the original plumbing (model year) but failed to replace the flex gas lineI was informed that" I " should replace the lineThen came the billThe bid was $dollars and the bill was $When I asked why it was difference than the bid the response was additional partsReally, after all the years they claim to have done business, all of a sudden then aren't able to make accurate bid?