I know you specifically asked for just advice on who to call, but I want to tell you I had this exact same issue, although on 16 year old tub faucet.
I have very little handiness, and no plumbing expertise, but after watching a couple of YouTube videos, I ordered the washer kit, and honestly, in less than 30 minutes , and about $6 spent at Amazon,I had it fixed.
Just curious, what brand and model is the faucet? Is it a Delta?
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