You should NEVER "let it go" when it pertains to a gas smell! That repair man should have his head examined! Yegads!!! I would definitely get a second opinion, and have the oven on for awhile before they show up. Cookies always help their attitudes, anyway!
If that doesn't work, call your utility company--they will send someone out to look for a leak. I had a repair man that swore up and down they couldn't find anything, then the utility company guy sprays some soapy water on the connection and viola--bubbles (i.e. leak). The connection was loose.
It does sound like it's an appliance thing, tho.