Handwritten modifications and interlineations are never a good idea. Just ask the vendor to confirm what was agreed upon and ask that a new estimate be prepared before installation.
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Honestly, the best way to solve this is to ask the vendor. If you think you are getting six, ask them to put it in writing.
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Mr. Lewis has given you a good answer.
While the ambiguity is the fault of the person who wrote up the estimate, and perhaps you could argue that he should take the loss for it, do you really want to have a legal dispute over one-sixth of a $1,908 deal?
Best solution: Ask the vendor to issue a new estimate with the correct number in it.
And by the way, why not just put in either the word "six" or the number "6" and be done with it? It's silly and unnecessary to spell out the number and then put the number in parentheses--and in this case, it caused a problem.