You are. No written contract means no warranty.
Even with a contract, would the plumber warranty their work for four
years? That's an awful long time.
There is no way to PROVE that the problem stems from the original
You said it was an honest mistake from an otherwise good plumber. To
keep the peace, and still be able to call on this plumber in the
future, I would pay him his bill, pay the repair costs because of the
lack of a contract and warranty, and move on with life.
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